I created hundreds upon hundreds of worlds and deleted many too before I created my main world LIAF. I stuck to it (so much in fact that I've spent over 6 days on it.) because I always had some amazing project going on, whether mining, breeding/slaughtering animals, expanding my base or even harvesting sugar cane.
I never understood how could people NOT stick to one world.
You just need to have huge projects (multiple projects at once so you don't get bored). I think it also helps to organize your chests and buildings.
I don't know for the others, but it's fun to make a city and always improve/expand it just so when you leave to work on another project and then come back to this city, you'll feel like home.
And if you really are fed up with your part of the world, just move away and /setworldspawn somewhere you like, it'll be just the same as starting a new world, but you get to keep your old stuff built where you started initially. It's also a nice feeling to randomly stumble upon your previous builds when travelling.
I am on the opposite end of the spectrum. While the process of starting fresh and working your way up is quite fun, it's also a lot more fun once you have some ambitions in regards to things you want to build with what you have. I have only ever been in one world (technically two but my first one was corrupted), and have had it since June 2013. The thing about starting over, is that you don't get the fulfillment of the game's experience if you keep starting anew. Part of the fun in the game is to aspire creativity - as a creative outlet with which you can use what you have to build something great!
This may be subjective, but I believe it to be a common misconception that the game "ends" when you achieve all the highest armor/tools (diamond, as you stated you have done), and/or fighting the Ender Dragon. But Minecraft isn't about any of that. It's a sandbox game, after all. In regards to SP, it's about building - building things that come from your heart and your mind. I like what others have suggested - always keeping one central project that you continue to develop. That's what I've done, and will probably do indefinitely. I do this so that I know I will never get bored in the world.
One thing I may suggest from experience, is plan ahead! Draw a map! Sketch out some ideas and a schematic of what you want to build. What I do at the start of each year is I draw out a map of what I envision my base to look like at the end of the year, and then make a list of the projects I want to include and a short description of what they will do/be. I've done this for the past two years, and I'm working on a plan for next year as well! And, while this helps inspire you, what's even greater is that you never know what kinds of things you'll build along the way - things that maybe you didn't plan initially!
This was a longer post than I had wanted, but I think I got out what I wished to say. I'm somewhat a freak in that I document everything, but that also helps me to stay interested in what I'm doing (and not just with Minecraft, but with any of my endeavors). Hope this helps!
I did this when I first started out, I suggest taking some time to figure out exactly what you want to do with a world, and then explore a seed to see if it has what you're looking for. A lot of the time I'll find areas that I absolutely love the lay out of, and I have to build with. It's really all about what you're looking to do. Right now I'm about to make a wizard tower on this really cool mountain biome that I found
This may be subjective, but I believe it to be a common misconception that the game "ends" when you achieve all the highest armor/tools (diamond, as you stated you have done), and/or fighting the Ender Dragon. But Minecraft isn't about any of that. It's a sandbox game, after all. In regards to SP, it's about building - building things that come from your heart and your mind. I like what others have suggested - always keeping one central project that you continue to develop. That's what I've done, and will probably do indefinitely. I do this so that I know I will never get bored in the world.
TheMasterCaver's First World - possibly the most caved-out world in Minecraft history - includes world download.
TheMasterCaver's World - my own version of Minecraft largely based on my views of how the game should have evolved since 1.6.4.
Why do I still play in 1.6.4?
I tend to make new worlds fairly regularly. It all just depends on how you define success, or completion, or victory. For me getting Steve into a safe, stable condition is pretty much the goal. Xp spawner, various passive mob farms, good house, wheat/carrot/potato/etc. farm. After that, I explore some, but usually end up playing that world less and less. Then I try and get Steve a dog if I haven't already, and let him retire. I keep the world around for a bit, and visit occasionally, but sooner or later it'll get deleted. But people play differently, and for different reasons. I'd say that if you want a reason to play a world longer, you need to change your goals.
I have this problem with my nephew; he keeps wanting to make new worlds when we get bored with the one we are on. What I do is just tp somewhere 10000 or more blocks away and it will seem like a new world. You have 60 million blocks you can go in any direction, pretty sure you won't run out of fresh terrain anytime soon
What helps me to sticking to s a survival world is setting goals. Although I usually love to play in survival, sometimes I can find it hard to get into an world it self. So I focus on one project after another and I try not to allow myself to get bored.
Like many other people said it's mainly about having big projects; things to build castles, houses, you could even build a sea base. One of the projects I've done in all of my survival worlds is to create a different defense system per world. The first world I had just used walls; in the second world I built a river surrounding my base; in my current world I'm terraforming the mountains around my base. It should just be something different about every new world you make; a defense system might not work for you, but, you should do something new in every world.
I use AmidstExporter to find all villages, temples, witch huts, and strongholds in 9 blocks that include my home and the surrounding 8 blocks. Before moving to a new world (excluding a new MC release) I try to completely explore my existing world. Scenter helps me find dungeons (search for mossy, or chests). While doing that I (excel) track all mines I find. On the rare occasion I've explored/looted all I've found in those 9 blocks, I expand 1 block surrounding those (40 more blocks). I've yet to complete that task before a new MC release.
Why did you never make a backup, especially after so many years?
Schofield's Second Law of Computing
"Data doesn't really exist unless you have at least two copies of it."
-laws-of-computing/
That aside, I have no less than 4 copies of my first world, which will be 11 years old next year and recently passed 200 days / 4,800 hours of playtime; the current copy being played on, a backup from up to a week or so ago (on the same drive/computer), a backup on an external drive (from up to a few weeks ago), and a copy in the cloud (from the last time I stopped playing on it for the time being. Technically, 5 copies since the last is in my Dropbox folder and online on Dropbox itself).
No, I have not had major issues with world corruption in the past; the last time I reverted to a backup was after a UPS failure (it just decided to die and cut off power to the protected outlets, that aside, it has prevented many more actual outages from affecting the computer), while I was playing; there seemed to be nothing wrong with the world but I don't take any chances, and when you use mods there is always some additional risk (then this also applies to official updates, and Mojang has shamefully not bothered fixing many serious world corrupting bugs; I'm probably a lot safer in this regard since I've fixed many of them and never updated to newer versions and only use my own mods so I know all their code and workings (an example of a world corruption bug which affects the latest versions and which I've never observed myself; a bug which does affect older versions and which I fixed hasn't been fixed in over a decade despite multiple proven fixes provided).
More like how do players start over and over again without making any progress? I had some farms, had some mapping done and built up a stone storage for a large sandstone build I was planning. Had plenty of iron, gathered 6000 magma blocks for the boat loader gold farm and was ready to start exploring more.
Too bad Wythers was released and the world gen was awesome with new biomes. So I made some temporary saves and found a seed with a mountain village. Had to sac my old world and start over for Wythers and now doing the manual sugar cane farm with 12x12 stone house. Died to everything, zombies, 2 shot by skeleton, creepers blowing my redstone inventories up and that hoglin that killed all my glowstone (the piglins bartered all my gold away when I returned for 1 fire potion) Still that's nothing compared to facing those dreaded shulkers again and travelling 4K blocks for that first elytra and dragon head.
The game gets easier the with loot you get because if you die there's always more in chests and the farms keep producing more and more, just make something big and make your next megabase. Make the sand duper, the cobblestone generator, the tnt log generator, the iron farm and a megabase with redstone vault doors, underground area and keep adding. Those elaborate doors and patterned flooring can be added later, get the scale done first. There is no reason to start over again.
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