Sometimes I write many a limerick, Cos it’s a poem that you can write nice and quick. But if it’s too long for you, Maybe try a haiku? Or write your stories in pentameter iambic!
Sometimes I write these three-sentence stories I call "kernels". They are tiny, but finished. And they usually take just a couple of minutes to do. Somehow that feels better to me than chipping away at some big thing I'll probably never get done.