You could try The Storygraph. While it can also be used for tracking and challenges, it has really good recommendations in my opinion. If you want them to be based on the books you read, you need to join the plus plan, but there are other ways of discovering new books as well:

Firstly you can fill out your preferences (genre, mood, some keywords, etc.) and you'll get a list of books based on that.

Secondly you can simply pick one of the books you enjoyed and click on "Browse similar books". Often the recommendations are quite good and the platform doesn't only show the popular one's (I've had books recommended with no more than eight ratings).