AI is currently all the rage. I know a guy who does neural networks training, and it’s the closest job to Pokemon trainer that you can have. He does not know any programming language, it’s all purely data processing, and it requires a heavy math background. It’s still an 8 hours per day job in a corporate environment, and a half of it is fixing his computing farm, because there’s no dedicated sysadmin for replacing burned videocards.
Another math-heavy option is signal processing. I’ve worked in a company which produces wireless communication hardware, it’s like 200 people, and there were two signal processing guys who patented an algorithm which increases data throughput by something like 0.5% in some specific high-noise scenarios, they are listed together with CEO on their website About page. That said, all the easier tasks for signal processing are already done, we’re already at the theoretical limit of Shannon theorem, so you’ll only be making gradual improvements.
I would also recommend cryptography research, but it requires a lot of coding knowledge, even if you’re not writing any actual code, and paranoia is pretty much a requirement.
It’s just an overpriced FreeBSD.