I have a very productive workspace; own room, fast equipment, good workflow. I eat healthy, sleep early, wake early, get enough exercise.

I've tried all the major productivity tips - meditation, Pomodoro, gamification, watching motivational videos, RescueTime, nootropics, plain grit, keto. They help for about a week, but then I build immunity to them.

I can easily cold turkey something like Facebook but this just ends up replaced by something else like breadmaking or reading books.

I tried working full time. I can work 14 hours/day full time just fine. But when I'm done with it, I still go back to working minimum hours.

I like my job and I have above average motivation and discipline. I have no willpower issues otherwise.

What else is a good way to increase my work rate?