@BingeWatcher I am going to let you know what we did since my son was /is a math kid also. He actually did several summer engineering programs through out high school to make sure he enjoyed this type of learning. He is in industrial at Michigan as a sophomore. He is more into the business aspects of engineering and likes but doesn’t love physics. Financial engineering might be something he will look into but he has a ways to go so who knows. He loves the learning process that only engineers go through.
When taking him to see schools we had him meet with professors to ask about other careers with math besides engineering. At University of Chicago we met with the head of the math department. Besides him loving this question the answer basically was… What can’t you do with a math degree!! He just rattled off professions left and right but opened our eyes to the possibilities. He also gave my son a calculus problem to show him how they teach. Much more basic then what you would think. My son had Calc 3(multivariate Calc) as a senior in high school so the problem was pretty basic anyway to him… Not me… Lol.
When going on the Michigan tour he met with both engineering and the Actuary head of the Department. He was actually very intrigued with Actuary.
So my suggestion would be to meet with a math professor at a college and discuss the many fields of where math can take you. It’s not just all teaching. Ie:a math degree with CS minor is a very strong degree.
For my son it just lead back to engineering but learning about all the possibilities was fascinating to me.