There’s an instance called literature.cafe that has a lot of writing related communities. I see writing prompts somewhat often while browsing all. It’s not the largest of instances, but it might be a good place to start

Her name is Vivian, and up until the last two or three years she is the only daughter he had. According to her, Musk selected male embryos for IVF (which is how all of his children have been conceived). I’m not sure how Grimes and Shivon got around that to have their girls with him

Voyager doesn’t have the ability to do this in the app, you will have to use a browser