Find a professor at your university that works in a non-math field but is still mathematically sophisticated enough not to bore you. Then take their class (assuming that it focuses on their research rather than being some sort of introductory-level class). Possibly you are unable to figure out if someone satisfies these criteria. If you’re willing to reveal what university you are at, and link to its course catalog, I can throw out suggestions.
Find a professor at your university that works in a non-math field but is still mathematically sophisticated enough not to bore you. Then take their class (assuming that it focuses on their research rather than being some sort of introductory-level class). Possibly you are unable to figure out if someone satisfies these criteria. If you’re willing to reveal what university you are at, and link to its course catalog, I can throw out suggestions.