I am a list person, so I would make a list of all UFO's (could be scary, I know) and prioritize them. If there are a few that could be finished with minimal work I would do those first. The rest could be prioritized by season or recipient. When you go in your studio, take out only the #1 project and work on it for a set amount of time. When the time is up, set it aside and work on something else. Maybe try a new technique, or make a sample of a block you've been wanting to try. Don't start any new big project until you have completed two UFO's. Eventually your backlog will be down to a manageable level it will be easier to organize your sewing time.