Today I encourage you to take a second look at a story you’ve written before.
Take a story you’ve written before and write it again from a different point of view.
You can rewrite the events of the story, as viewed by someone else.
You could choose to use the original story as a jumping-off point, that simply informs your knowledge of this formerly-secondary character.
Feel free to write the story in a completely different form (if the first one was a series of letters, you could write this one in a more narrative form.