itch.io

I think the most dedicate place is in the Discord Channel, though I do not do Discord so I just spam mine here from time to time and the ones I actually put effort into are posted on X with the hashtag #StarmakerStory

Dr.Muramasa might be able to provide more info...

Hello there, 

its fine to make a post and share here, the discord has an ai channel, X is your own account so that would be up to you.

You have a couple places where you can post.