Z-Library is definitely what you need, but there’s still no dedicated community on Lemmy that I know of. You’ll find all that you need to access it in Reddit (r/zlibrary). Anna’s Archive is also very good, but sometimes the latest releases aren’t found there, while they are on Z-Lib
As a non American user, I recently struck gold finding r/USDdefaultism. It’d be nice if the need for this kind of sub doesn’t migrate to Lemmy as well though.