I've been in similar slumps too. Also have several UFO's to finish. So, to work on one particular UFO, I used the pieces/piecing for that project as leader/enders while I was working on something else and, I was amazed - - - I had finished several more blocks. It also get me re-interested in that UFO.
Bottom line, try doing some of the piecing for one project as leader/ender while you're working on something else.
You're actually working on two quilts at a time!!