I can tell you that if I were in your case I would quit the 70 to 90 hrs grind. It's not worth the long term damage to your mental health. If you haven't, you will soon burnout. Money is not everything. The only reason I would work those hours is if I was doing it to advance my interests not someone else's.

Before you do anything seek a career counselor that will help you plan your next 1,3,5,10 years. You'll need to review your plan every year but at least you'll have a road map of where you are going.

Also understand that learning new stuff that will be out of date in a few years is not worth the time. There is only so many times you should have to learn a new language and stack. Spinning the wheel leads you nowhere. Focus on knowledge that will serve you your whole career.