Have you checked out kbin? It has some of those features, and you can sub to lemmy communities with it. It also allows you to follow users, which lemmy doesn’t seem to do. But you can’t save posts at kbin, which is something I use a lot.
Edit: literally just discovered you can save comments and posts, at least here. I don’t know if that’s new or if I missed it somehow.
App Cleaner!
https://freemacsoft.net/appcleaner/