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.
Easy to say when you're confident you can get a job that's just as good as what you have. Fact is, I am not. The ads I read these days for IT positions all look terrible.
"Those who trade freedom for security will loose both in the end"
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.