BooksandLala was going to be my recommendation as well!

For OP, LaLa does lots of themed months or experiments with her reading. Like she recently had a month where she tried to figure out if she liked romance so she had one video where she read books recommended to her by friends, one where she read books her viewers told her she'd hate, one week she used a professional service, etc.

She's just very good at figuring out what she does and does not like about a book, and hearing her explain that really helped me figure that out for myself.