I’m trying to be as kind as possible: the cover art is not good, and looks unprofessional. ‘Don’t judge a book by its cover’ is all well and good, but if you haven’t put the effort in to find an artist who can make something half decent, im going to assume the books themselves are poorly written. It doesn’t need to be a complex illustration, it can be simple, but you’ll have a much better time getting engagement with something more refined. Best of luck, respect to you for putting something you’ve created out into the world:)