Simple: you don't have the information about what to write next. As a part-time fiction writer, I generally find the problem is about visualization. I may kno

Simple: you don't have the information about what to write next. As a part-time fiction writer, I generally find the problem is about visualization. I may know what I want to write next, but if I can't see it, then I can't write it. But not everyone writes visually in the way I do. I find the best way to break past that is to go somewhere interesting, and then imagine my characters in a similarly interesting place.