A script that saved you an afternoon deserves a second pass before you forget how it works. Extract the hard-coded paths into arguments. Replace magic numbers with named constants.
Add a usage example in a comment or --help text. Future you will not remember the exact flags. Keep dependencies minimal; a helper that needs a full framework is rarely reused.
Test the happy path and one failure case. Even a tiny script benefits from a sample input file checked into the same folder.
Finally, decide where it lives: personal toolkit, team repo, or public gist. Location determines how carefully you polish it.