Attention is your scarcest resource

To be reliably able to focus on something, you need to be intuitively, emotionally invested in the outcome.
Make sure that you are only ever working on one thing at a time. Even if I got stuck on that one thing.
Have one obligation to other people.
Employ a “bullshit timebox”—a one-hour period a few times a week when I do all the things life is too short for.