As you know, Goodreads is owned by Amazon, so if you want an alternative in Europe here you hace a couple:

• Bookwyrm (www.joinbookwyrm.com) is the fediverse federated books discovrery and communities alternative to Goodreads. There are many european instances, so you just have to search for one that covers your interests and join.

• The StoryGraph (https://www.thestorygraph.com/) - It is headquartered in London, and isd a platform for discovering and reviewing books, with several social features.

Do you know other alternatives to Goodreads in Europe?