Contrary to the other comments saying to carry a pocket computer: my brain. Hence the improved memory. I offload my thoughts into my notes when I can. If it wasn't important enough to remember until I can find a seat at my desk, it wasn't important enough to write a note on.
We have computers we can carry around in our pockets now!
Lots of approaches exist, mine is Obsidian + Syncthing and just jotting down notes on my phone that I go flesh out when I'm back at my PC.