Have you heard of being an Actuary? Is it one of the most in demand job fields and highest paid in our country right now. Here is one website that tells you more. https://www.thebalance.com/actuary-career-information-525661
Or just google: What is an actuary? there is another site called Be An Actuary that is pretty awesome too. Another idea is to be a college or high school teacher of mathematics. That is what I did for 16 years. You teach math to others and solve math problems all day. At the college level you not only teach but you are given time to research and solve problems.