Bookwyrm & Librarything. I've never used goodreads and am a Long time Library thing user. I like Bookwyrm for tracking ebooks and tend to use Librarything for physical books, I also use a specific language bookwyrm for tracking 2nd language reading
The Storygraph is a fantastic goodreads alternative with way more stats and helpful info on your reading habits. It’ll import your goodreads history too!
Been using this and it's great! I especially like that I can put in half and quarter stars for my ratings. Only downside might be the UI which can feel a bit off.
I'm mostly on lovelybooks.de now. It's a nice community that is not owned by amazon, however it was bought out a couple of years by Hugendubel which is a big book store chain in Germany so it's not exactly independent.
did you check HardcoverApp? https://hardcover.app/ It's bootstrapped, you can track books, and get recommendations. They are working on launching Discussions.