Ok. I disagree with all posts after the original poster. The OP asked for ideas. The responses are all about how it won't work if that isn't your nature. Phooeey!
At any point in our lives we can regroup and proceed in a new way. I admire people who have fewer to no UFO's.
In answer to the original question I am working on finishing projects and trying to limit what I start. I do find that lately I like a small landscape project ( a lot of auditioning fabrics and some painting, quilting) to alternate with a piece that is heavy on piecing so I can do what strikes my mood. I do want to break the cycle of start something, move on, start something...
I want to understand processes of those who are more productive than I am. I have extra time now, because I no longer work, so I am eager to proceed in a more efficient manner.