TBH I never found the fishing in BW to be better than anywhere else, but it is pretty easy to get to, and get out and away from people.
If you get wayyyy back in the everglades it'll feel remote but can be tricky to find a pad to sleep on, but close to the salt is where the more interesting fish are, and of course where more people are.
Lots of places in Maine line BW, Ontario, and Nova Scotia are like BW, basically the northern Canadian shield will be near identical and offer similar fishing.
You could also head to Bob Marshall for some bucket list fishing but that may be more rafting and more trouty, and too far away
Are you specifically looking to stay in the US? does it need to be canoeing? do you need to be able to drive to get there? Lots of great backpacking routes in BC that'd put you on steelhead and salmon water, and inland in the mountains there is great trout fishing.