It almost sounds like you're experiencing a kind of post-partum depression.
I would recommend that you not "quit", but rather "step back." If you've launched the project, and it's being used, then how much more do you really need to do?
You must have monitoring that you can check occasionally, so maybe you can just let the thing simmer[0] for a while. Take your mind off it, do some other stuff that you enjoy, then take a look at your logs in December. The watched pot and all that.