Looking for Short Fiction Recommendations (Under 170 Pages) – Themes: Literature, Writing, or Authors

Hi everyone! I’m searching for short stories or novellas (under ~170 pages) with themes related to:

Fiction about fiction (e.g., Kafka on the Shore, If on a winter’s night a traveler)
Stories about writers/authors (e.g., Misery by King, The Ghost Writer by Roth)
Meta-literary or experimental narratives (e.g., Borges, Calvino)
Books that explore the act of writing (e.g., On Writing by King—though ideally fiction!)
Open to any genre (literary, horror, sci-fi, etc.). Bonus points for lesser-known gems!