Many people talk about the "T" employee - the person who acquires deep knowledge in one area but then acquires skills and experience very broadly but at a much more shallow level. And if it is a serif font - you have a couple other areas where you also develop some depth.

A second approach might be more like an "H". You develop two strong specialties, either of which on their own are valuable. But then you figure out the cross-disciplinary bridge that ties them together and makes you more productive and valuable than either would by themselves.