I went through approximately same stages, and eventually found that the knowledge base is mostly useless. What it matters turned out to be my own words: my pers

I went through approximately same stages, and eventually found that the knowledge base is mostly useless. What it matters turned out to be my own words: my personal notes on the subjects, my worklog, my emotions etc. These bits are something you can't easily reconstruct without a right context, and keeping the context is getting harder and harder as you are getting older.