If you feel burnt out from a project, it probably means it's time to stay away from it. If you push yourself anyway, you might end up hating it.
What I'd suggest is : Focus on small, new projects/prototypes to practice skills you weren't focusing on previously (I'd recommend UI or sound, don't underestimate text based gameplay!)
Then when you feel like it, come back to MoC, either update it with knowledge you've gained, or even remake it from a fresh project file!
I won't pretend like I'm a sage in the domain, you already seem to be doing great on your own, but from a creator to another, enjoy your break first.
Burnout sucks 10× more than the guilt you may get when taking a break.