I got my Model 3 on October 27th and am also stuck on this firmware.
I contacted support, and there was nothing they could do.
I even went so far as to take it in for service, and they say we are trapped on "Factory Island" (stuck on the factory-installed firmware) so they can't even push to our cars.
I asked at what point they consider it a problem (like what if there's an issue with our car preventing it from updating?) and they said in so many words, "never".