There is a name for this strategy: success spirals. It is discussed in Piers Steel's book, The Procrastination Equation, as well as in Luke's article How to Beat Procrastination and in Nick Winter's ebook, The Motivation Hacker (both of which are heavily based on Steel's research). In my opinion, it is one of the most powerful productivity techniques out there.
Repositories are awesome, and we should have more of them.
I recently completed BJ Fogg's Tiny Habits, and it's a pretty lightweight way to install new habits (recommended). However, I realized I could use a better repository of useful habits.
So, please use this thread to suggest habits that you've found useful. Bonus points for evidence/anecdata of usefulness.
Obviously, 1 habit per comment makes upvotes a clearer signal of collective approval.