Started writing down small things I figure out during the week instead of trying to remember them. Surprisingly the habit stuck — turns out most of what I forget isn't complicated, I just never wrote it anywhere.
Nothing fancy, just the boring reliable stuff. A plain text editor, a terminal, and a notebook app that doesn't try to do too much. The fewer moving parts, the less time I spend maintaining the setup instead of using it.
Every time I rush the last ten percent of something, I end up redoing it later anyway. Slower but once is starting to feel a lot faster than fast but twice.