Releasing is the right choice, well done with this it’s really cool.
I’ve only had a short play but a solution to this problem might be to show authors rather than books. Or select authors outside of the list the user has shared and then a top n (1,3,5) for each of those.
I feel like that’s how you’d recommend to someone else - type of book -> unknown author -> best matching few books from them.
After that the other side would be trying to find some diversity (if you think I’d like author X, personally you might suggest three different styles of book from them rather than three very similar books from them)
I’ve only had a short play but a solution to this problem might be to show authors rather than books. Or select authors outside of the list the user has shared and then a top n (1,3,5) for each of those.
I feel like that’s how you’d recommend to someone else - type of book -> unknown author -> best matching few books from them.
After that the other side would be trying to find some diversity (if you think I’d like author X, personally you might suggest three different styles of book from them rather than three very similar books from them)