Willpower is clearing the decks. Doing the things that need doing so the space opens. The aligned action doesn't need forcing. It needs room. Willpower creates the room.
Zeroism is the practice. Clear everything. Be mostly space, occasionally action. The opposite of what most people run, which is mostly action, occasionally space.
Zeroism is nothing outstanding. Nothing pulling. The mind has nothing to track in the background so it settles. From that settled place, you act. One thing. Then back to zero. Then the next.
Every unfinished task is a background process. The mind tracks them whether you ask it to or not. Ten open loops is ten small drains running all day.
The most difficult action needs the most space. Free the space around it. Clear what's in the way. Give it room.
Open loops drain space. Zeroism closes them.