The best way for a busy professional to find their true purpose is to strip obligations from their regimen one-by-one.
After all, when we're truly being, we forget about what we're actually doing. The outcome is action without too much thought and stress.
Thus, when you remove one of those "things," the resulting feeling will either be a liberation or an emptiness.
It's an experiment in the measurement of stress, but more importantly, it's a path to identifying what makes you whole.