Consider taking a longish holiday (like 3 weeks)? If at the end of it you don’t want to come back, quit. But that might be long enough to scratch the itch and feel refreshed.
But dramatic quotes aside, since I have kids myself, I am leaning towards security, too. But I feel that this has indeed been blocking me a lot and I felt stagnating. The world is big and full of opportunities, but only if you go out and dare to look at them.
So I do recommend at least a long holiday ;)