I know it sounds like a crazy idea but hear me out. The first few generations of creators in a genre tend to take inspiration from sources outside the genre they are creating. Early Cyberpunk took influences fro Film noir, early superhero creators took influences from the pulps, and myth etc. This makes sense. The genre isn’t big enough or self sustaining enough to be incestous yet. But that third generation, the generation that grew up with the genre changes things. It’s usually at that time that stuff begins to change. The genre almost always becomes more internalized as primary influences shift from external influences (other genres, classic literature etc.) to internal ones ( other works within the genre, namely the works the author grew up on). It works out pretty well at first. These authors usually bring new insights to old ideas. But what inevitably what starts happening in this period, is that people start canonizing, what the genre is and isn’t. Tropes start to become cliches, and the whole thing starts to become really incestous and unoriginal. The only time innovation happens after this point is if someone who didn’t grow up in the fandom, decides to write in the genre. And usually in that case the readers usually hate it. They’ve been trained to look for tropes rather then story.