did you check HardcoverApp? https://hardcover.app/ It’s bootstrapped, you can track books, and get recommendations. They are working on launching Discussions.

I discover recently Hardcover App. You can keep track of what you read, and what you want to read. Also, you can have a list of books owned. They have a matching system for books, based on your lists.

https://hardcover.app/join?referrer_id=2223