I just read this: https://www.brainpickings.org/2012/02/22/henry-miller-on-writing/
Miller echoes much of what I’ve read elsewhere. Namely, don’t write according to “Do I want to write right now?” Write according to a schedule or system, what he calls a program. Professional writers don’t wait around for inspiration—they work, and all that.
To some degree, I have done this. I did it more so when I was working on my first draft, when I could set a daily goal (2000 words). It’s more difficult now. I suppose I could set time periods. But this is difficult given that I write only when there’s nothing else to do. Writing always takes second seat.