I am a weak player and I never do this so I can't vouch for the method but I have seen a lot of people suggest that you annotate your own games right after the fact so when you review them later you can see what you were thinking at the time.
Watching your own games.
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Over time when you get better you sometimes watch your old games and notice mistakes you've made. But when it's reverse. When I'm in a slump or have a lower rating than I've had before. I can sometimes watch my old games when I played better and not having a clue what my plan was. I can't follow my own thinking. Weird and a bit sad.