If i have a big project like a queen-sized quilt going, and get bored with it, or just find that I am not really exicted about it, but am dying to do let's say a particular block that I recently saw a quilt made with. I give myself permission to try that block. One block will not hamper the other from being finished, and I get to do something else for a change of pace. Changing my focus helps me keep going without "burn out".
Or I will have a quilt up to the quilting which I do mostly hand quilting, I do allow myself to have the fun of creativity on another project be it just sewing a dress for my DGD, or another quilt project. Even one for myself.
I find that the projects just for me take a backseat to those for someone else, so I always have UFO's for me to do.
But you do not have to change if what you are doing works for you.