Every year, my wife and me go for coffee and summarize what went well and less well in the last year and which goals we set and achieved (or missed).
This is loosely based on the life frame technique outlined in Getting Results the Agile Way by Michael Kropp.
This year, I made this into a proper template to have multiple years at a glance.
Maybe it's useful for someone: https://docs.google.com/document/d/1Cy6ALPwxF5ERrNMTm8dopM4L-ZbDf4OtZfcoE-YBf-g/edit?usp=sharing