Purpose grows when ability meets need.

Purpose is not a property of a person, it is what happens at an intersection. Your ability on one side, a real need on the other. Ability without need feels wasted, and need without ability feels hopeless. Where both are present, purpose tends to appear without having to be searched for.

Map them separately. What can you actually do, and what actually needs doing near you? Look at where the two lists overlap. That is usually where to start.