Three things help with discovering and filtering new books:
1. I will often read books that are referenced within books that I have already read and enjoyed. That way I’m getting additional depth and different perspectives on topics I’m interested in.
2. Book recommendations from business leaders on Twitter. (e.g. Bill Gates)
3. Recommendations from friends.
I have heard goodreads is a good way to exchange book recommendations with friends, but I haven’t tried it yet.