I could write a book. Maybe I will, one day. But mainly, for me, it comes down to a combination of lack of resources (mainly time) mixed with my own shortcomings, specifically a pathological inability (or unwillingness) to focus on just one small, narrow, focused thing at a time.
That said, after spending a pretty good chunk of the last two years not dealing well with my own emotional states (in reaction to COVID, the lockdowns, my mother passing away, etc.) and not doing much work on the company, I've gotten really re-energized and re-focused for the past month or so and have started getting things done again. There is still way more work to be done than there are hours in the day to do it, but I feel good about getting back in gear and seeing some forward motion.