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.
Every year, I purchase a physical planner. It helps me stay organized, remember events and tasks, and since I make notes of my day to day in it, also acts as a journal. I’ve used the same company to create a customizable planner for the last 5 years and I love it.
Focus more of my stretches on hamstrings. I get back pain due to an injury and sitting too much. Taking time every day to stretch my legs and pay close attention to my hamstrings has really helped reduce my day to day pain.