Talk to people in your department about where students who enter industry end up working after graduation. Your university may have a kind of "jobs fair" in Autumn where companies come to recruit. Look into those companies and find out what skills they seem to like.

For what it's worth: I ended up going the quant/finance route (as a "regular guy" with no meaningful accomplishments). If I could start over I would try to do something involving data analysis and biology. I think RNA sequencing is on an exp(-a*t) cost curve, and it feels like this is a domain where data analysis could produce something of greater value than slightly more efficient asset prices.