When I was a kid, I put myself to sleep every night by imagining myself as a character in a superhero comic. Sometimes I was the superhero (a girl regardless of the sex of the superhero), sometimes I was the villain (again, a girl), and sometimes I was the Polly Purebred heroine who needed saving. It was fun and, more important, it exercised the storytelling synapses of my brain. Keeps brain muscles from atrophy.
To this day (or night) I put myself to sleep by creating a story in which I am one of the main characters.
Do you do this? If not, do you want to do this?
Pick a story, any story. Could be a Nancy Drew mystery, could be The Hunger Games, could be Outlander. Pick a body, or rather, a character, for yourself– either a preexisting character or make up an entirely new character and insert her/him into the story. Now, rewrite the story in your own words. Tell the story you would tell had you written that particular story.
I’m not suggesting you write fanfic. Except in your head.
I’m suggesting you grow your writing chops by learning from other genre writers. I prefer genre work because genre writers generally create more compelling, more romantic, and more relate-able characters. I’m not about to insert myself into War and Peace, although I’ve stuck myself into The War of the Roses plenty of times. (That Edward the IV was a hottie in his youth!)
Heroic books that make for great imaginary fanfic – Jane Eyre. Shogun. Outlander. Your favorite romance novel- insert title here ______________________________________________. Historical fiction. Norse mythology. Comic books– great for beginners. I mean, c’mon, who doesn’t want to fly or become invisible or shrink or make crazy weather? And Thor? He’s the best! Always been one of my faves.
Go for it. Like choose your own adventure. Rewrite your favorite stories in your head. Work those abs! Uh, I mean brain cells!