No worries I tend to overthink things.
It happens to me all the time.
When I get stuck on what the plot/story is going to be I usually design my characters (looks/personality). Designing them helps the story move along.
I take a shower to relax (showers bring inspiration). I search for comics/manga/manhwa/manhua/books/anime with the same genre to get inspiration.
Scumbag brain gets inspired on how to move the story along when I go to bed and try to sleep but I don't recommend it.
Play videogames with the same genre. Use childhood cartoons/fairy tales as inspiration.
Basically don't think how to move the story along but instead watch/read things with the genre, setting, and/or characters similar to the ones you thought about. While watching/reading inspiration will hit you. Trust me. It may take a while but it always happens.