First impressions matter, and branding matters.
Fonts can easily become an obsession when it comes to figuring out a books cover. Genre research gets us pretty far in recognizing patterns but I doubt many (if any) of us are typographers. So even if we recognize a pattern to font styles, how do we identify it to recreate it?
Recently I found a cool online tool that helps with identifying fonts from an image. Pop the images you've collected while researching into here (https://www.myfonts.com/pages/whatthefont), it can identify a font with AI and get you pointed in the right direction for finding something that suits your books branding within its genre.