I second the writing prompts idea, and would like to offer an additional idea which might be a little strange. I used to love this subreddit called “/r/worststory”. It was a place for writing prompts where the idea was to intentionally create a terribly written story.

I got a lot of fun out of that subreddit, especially when there was a collaborative story thread. The basic premise of the subreddit made it a lot less daunting to post and easier to work out silly but creative ideas for stories.