Purpose is always attached to a problem. You don’t serve “everyone.” You solve a specific problem for a specific group. The clearer the problem, the clearer the purpose.
Don’t pick a problem because it sounds noble. Pick it because you can’t stop thinking about it, you feel angry when it persists, or you’ve experienced it yourself. That’s fuel.
Reflection:
What 3 problems in the world make you frustrated, sad, or energized to act?
Which one have you experienced personally or seen up close?
If you solved only one, which would feel most meaningful?