A file name your future self will understand

Give the next person enough context before they open the document.

Name the subject

Lead with the project or subject. Avoid a title that only describes how you felt about the file when you saved it.

Make versions clear

Agree on a simple convention with anyone sharing the folder. One understandable approach is better than several private ones.

Try a search

Search for the file using words someone else might use. Adjust the name if it disappears among unrelated results.