I’d say so. Improv comedy groups are hard to find, but you know what isn’t? A Dungeons and Dragons group.

Many people who play D&D are writers themselves. Maybe not famous or published, but it’s a narratively creative exercise. Older and more experienced DMs will happily help you learn how to write a character that is interesting and unique. And as you play, you’ll get a feel for how to write a story that you like.