I always carry a note book with me. It has my plan for the day (https://medium.com/@kristiandupont/high-resolution-planning-...), random notes and random doodles. I got into it after purchasing an old copy of Thinking With A Pencil (https://www.amazon.com/Thinking-Pencil-Henning-Nelms/dp/1626...) which I think was a recommendation from some thread in here.

I am not sure what it does for me, but I've been quite consistent for well over a year now and I do find all my old note books are quite fun to scan through.