Pros watch film of their losses more than their wins. The mistakes have the good footage.

Losses contain more information than wins do. A win can hide three mistakes that happened not to matter, while a loss shows you exactly where the structure gave way, which is uncomfortable and extremely useful. The discomfort is why most people skip the review.

Go back over something that did not go your way, once, with a clear head and no self-attack. Find the one moment where a different choice was available and note what it was. Then close it and go and practice that particular thing.