[impendia]

You describe your job as easy, and that you've stopped learning new things already. For me, that would be a dealbreaker.

I personally quit a job that was at least sort of along the lines you described, to go to graduate school. I'm now a math professor. Best decision of my life.

That said, if it were me, I would look carefully before leaping (which I'm guessing you've done thoroughly already).

Good luck!