Or any skill that you deeply value for how it helps you, but maybe easily overlooked by an outsider?
I think exercising atleast 2-3 times a week was good for me. Not that I look much different, but I do feel a bit stronger and that is nice. Neck isometrics and bridges too. They really helped with balancing looking at mobile or PC screens.
Learning some keyboard shortcuts was nice. The major one would be Win key + Arrow keys to manage multiple open windows/apps.
Then, finding that I can add commonly used options to the QuickAccess bar in Excel, Word etc. Libreoffice would probably have similar options too.
i moved one of those 8x2 cube storage shelves from next to my front door (where it didn’t get used) to my bedroom where i use it for “worn but not dirty” clothes
pile of clothes on the floor instantly fixed because now putting clothes “away” is the same effort as dropping them on the floor