This is cool. Thank you for sharing!

I wanted to add to others suggestions to consider adding more genre-like categories. I realize they aren’t as specific as “world war 2”, etc, but I think you will miss out without the common popular genres there. For example, “best fantasy in 2021” or “best cooking book 2021”, etc, overlap with tons of interests and seem missing. Maybe write down every genre in Amazon search and see how your groupings compare? Just my 2 cents!