This is fascinating! I recall talking to an editor at a conference, who was convinced that they had an amazing book series, if only they could get people to see it. They were on their third cover treatment, hoping to spark attention from a different audience. It didn't work. But they kept trying. And they eventually found the audience they knew was out there. The series? George R R Martin's A Song of Ice and Fire, which you may recognize from the TV series made from it, Game of Thrones.