I’m not certain about the accuracy of everything in OP’s post, but this is true for many Amazon Sellers:
I just don’t have the energy to adapt anymore.
Amazon does constantly change the rules and move the goal posts. It is a uniquely draining sales channel for a (very) small business, especially if you’re mostly a one-person shop and already doing everything for the business (which it sounds like OP is).
Now would I post up on the ASF about it? Naw. But if only half of all that is true, then my sincere sympathies to the OP and my full support of them closing this chapter.
Amazon can be a boon for the right business, but it is difficult every day, twice on Sundays, and three times whenever anyone mentions the FTC out of sheer spite–and it is not a good-fit sales channel for every product or Seller, even on the best of days.