"Do them because you want to, and not because of some other goal like money attention, rewards, etc."
This is an important preliminary step, toward productive mania, I believe. It's not clear though how to induce this. Are we really in control of what we find intrinsically motivating?
Let's say I have a programming project I'm working on. I'm excited about it, but only moderately so. I have a goal of turning it into a business, and making a moderate passive income from it. How can I turn this decent energy and motivation, into something explosive?
It would seem that I need to muster some intrinsic motivation, some desire to work on the project just for the sake of working on it, not for completing it, or making a business from it. I'm not sure how to accomplish that, or if it's even really possible when you're doing something that isn't entirely novel and new.
It's easy when something is new - You're intrinsically motivated to pursue it because it's, novel and exciting. But when you've done something before, it's less simple to find that intrinsic motivation.