The unfortunate corrolary to this is that if you are fueling your tasks with anger and caffeine, letting go of that anger can be supremely demotivating. Trying to be a healthier person to be around can turn around and sap your will for your efforts. At least that is how my experience has been.
So you’re saying substitute more caffeine, or are we gonna try a different emotion?
How about envy? Pick one person to be really jealous of and let that drive you to new heights. Or become a Sith.
I vote lust. Develop an intense fetish for your own ability to focus and be productive.
Personally I have been microdoseing anxiety for years. Sure, it’s a bad solution but it is a “functioning” solution.