MIT - Most Important Task
I am finding the concept of an MIT, a Most Important Task to be a terrific motivator.
It's exactly what it sounds like, there's one thing you really want to get done and once it's done, the rest of the day is good because that Most Important Task is already done.
It forces me to organize my thinking. I realize there's often a lot of things I WANT to get done, but then I can't accomplish them all and get frustrated. Too often, a "to do" list with me is just an ongoing memory dump, and I don't ever get a feeling of satisfaction. Whereas if I get the one thing done, that's "good enough" and anything else is even better.
Here is a link that might be useful: Most Important Task