Go to work on a regular basis.
Art is hard. Selling is hard. Writing is hard. Making a difference is hard.
When you're doing hard work, getting rejected, failing, working it out--this is a dumb time to make a situational decision about whether it's time for a nap or a day off or a coffee break.
Zig taught me this twenty years ago. Make your schedule before you start. Don't allow setbacks or blocks or anxiety to push you to say, 'hey, maybe I should check my email for a while, or you know, I could use a nap.' If you do that, the lizard brain is quickly trained to use that escape hatch again and again.
Isaac Asimov wrote and published 400 (!) books using this technique.
The first five years of my solo business, when the struggle seemed neverending, I never missed a day, never took a nap. (I also committed to ending the day at a certain time and not working on the weekends. It cuts both ways.)
In short: show up.