My bent is towards strategy, but in uncertain times, this can paralyze people. We think, "Until I know my life calling, I cannot make a decision."
Generally, we come to understand our purpose as we do the next thing, with one hand on our tools, and an ear toward heaven. We talk about the Head, Heart and Hands of a leader: there is a 4th H... Habits! Sometimes our habits lead us into our calling.
In fact, having the Big Picture in the wrong picture frame is stupid.
Dig into your worldview, the set of assumptions you have about how the world works. Get a little insight into your assumptions about life before you try to settle your purpose. In the meantime, do some good for someone else. Obedience opens the intellect.