The problem is never not enough things to do. It is getting lost in "too much to do", as if there is a demand on you. The solution is in choosing from the cornucopia what serves you best - and doing it consciously works alot better than randomly, where we have what's out there determine what we do next. Bad idea!
There are a million things you could do and thousands of things you could be better at. So you will have millions of things left on your "I'll never get around to this" list, with a subtitle "And it's ok." The choice of what not to do is a powerful tool. "That's not worth doing. Now, let's see, what is worth my time?"
The last question must actually be answered not just in the moment but most importantly ahead of time, in careful, thoughtful decision making perspective sessions. Those would consist of
Scheduled ahead of time as much as possible.
and always end it with "and so be it. I accept that there are many things I am leaving out - it is clearly by choice, given the limited time I have. On my "to do" list, though, are lots of things that make me come alive, that I can choose from, optionally, as the question of what to do comes up."
There are a few things I must do, absolutely, but there is lots and lots of optional time - about hours per year.