@bookstodon Maybe everyone already knows this, but in case you don't: there is a great way to search for library e-books you might like.
If you have Libby, do a filtered search for whatever you like in general. While perusing the results, tap on any book you have already read and enjoyed. Scroll down past the description, and it will give you suggestions of other books you might like. This really helped me.
This only works in filtered search, not direct search.