A few people have mentioned keeping things together. Every time you put a not-finished quilt away, be sure it is put away with all the things needed to finish it. Pizza boxes work great for this. Used ones can be used if you line them with freezer paper first.
I put my labeled pizza boxes in a stack, so I can readily see what is in each one. Then when I grab one off the stack, everything that I need to work on that one is right there. I haven't used some of the fabric for something else and have enough of what I need. That means I can get started working right away.
Good luck on finishing a few. Deadlines work for me. We have several small quilt shows near me, and they help me finish up something to hang in them. Nothing fancy, but finished items.