I am making an assumption here as you have not stated so explicitly. May be you are less challenged at your job and hence the thought to go get a degree, as get

I am making an assumption here as you have not stated so explicitly. May be you are less challenged at your job and hence the thought to go get a degree, as getting a degree has probably always been at the back of your mind. You are already learning higher math and advanced CS topics, so better to design your own curriculum and go for a more difficult domain, if you are not in one. Instead of a degree, do side projects related to the curriculum you design, get it added to your portfolio, if possible keep publishing the stuff you learn and it will be a better ROI. Also leaving job and just going to school may not be so much fun in other aspects as well (no income, working on subjects that you may not enjoy learning); for the no income part if you go do it part time, it can be insane hard work.