Where are you getting your list of genres from? It looks like you are missing many of the ones supported by goodreads at https://www.goodreads.com/genres Not to mention all the ones people create by creating shelves.
I'd suggest lowering the default for number of ratings from 50k to something like 4k, so you'll pick up relatively newer books that are popular but don't have a lot of ratings yet.
The genres are limited to the most popular ones at the moment. The slider is also adjustable, but the default is set to 50k to show relatively well-known books at first sight.
