User blog:Banned In CP/Recurring Themes: Good or Bad?

So I've started to notice lately that I have some themes that I end up falling back on, namely that the main character has some kind of sob story and is depressed, usually in some kind of grief. Or that the story revolves around being in the woods and seeing a monster/s of some kind. Not all of my stories, but I have noticed this. What do you guys think about recurring themes? Are they good or bad? When do you think it becomes a trope within a writer's works? I've been feeling a bit self-critical lately about my writing, so I just figured I'd ask you guys for a reality check.