In general, rather than plot structure, I prefer to think of it in the same way one might think of a short film: a short teaser about your world, that’s a self-contain character-driven arc, that gives people a taste of what’s to come, but wont necessarily be present from the get go.
Generally, when I write them, I top out (well used to) at three cut scenes. Now the problem is, if you get really invested in your characters, sometimes what starts out as intended to be a 2,000 short, might become 12,000 words.
That was the case for my novella Anna-Marie With Her Shotgun, that was only suppose to be 4,000 words. But ballooned into its own 23,000 word novella.
So I do suggest using caution.
And the great thing about short stories, you’re always free to visit them later. I might do that with this “Time traveling serial killing mechanic meet Viking noble girl” thing.