Derivatives of the three act structure include the Hero's journey, Dan Harmon's story circle, and the five act structure.
Terry Pratchett had a good go at a one act structure. His narratives often tended towards a certain flatness in which all parts of the tale have approximately equal tension and about the same value to the story as a whole. They tended, in reality, to actually have two acts one that started at the beginning and took the majority of the book and a much shorter one that showed people getting back to "business as usual"; that was often a couple of pages or less.
I don't know if it's out of subject, but a joke has a two part structure (my source is the Netflix's Nanette show but I'm sure you can find others).
A story "of which you are the hero" might also have a different structure (I absolutely don't know, but it could be a good idea to take a look into it).
If you want to find other narrative structure, you would probably have better luck looking into "non-typical" story, like poetry, theater, opera, ballet, etc...
Anyway, good luck finding other structures. Sometime, it feels like even the Kishōtenketsu doesn't exist (especially when you read an article saying: "the narrative structure is always the same").