> That still leaves a lot of G1, Japanese, European, Beast Machines, early CHUG, movie-verse, books, and comics.
The post '87 G1 stuff will do well and be worth the time and effort but I'm not so sure about the rest, especially if it's loose. It's a buyer's market on ebay right now unless what you're selling is rare or sealed. Everything from Beast Machines through early CHUG is gonna be tough to move. And there are sooo many flakers and non-paying bidders bidding up auctions and wasting people's time on ebay that it almost isn't worth the headache to do legit auctions. If you do go ebay just name your price.
December is also a tough month to move used toys because people are spending money on gifts for others.
The success of alternate selling outlets like OfferUp, Craigslist and Facebook Marketplace depends on how large your metro area is. I think the best results will come from joining collector groups on facebook and posting your sales there.
I don't know how well Euro and Japanese G1 is doing right now. I know there's been an incomplete boxed Stepper on ebay for a while now (
https://www.ebay.com/itm/144819523140) and nobody's bit on it @ $400 US. I'm not saying all Japanese is dead based on one auction but there was a time when even something like this in this shape wouldn't last long.