You see this everywhere, everyone looking for what they can't have.
The problem, is of course, in the question. When there's no ready answer you need to think it through and come up with a better question. The question is better asked "What can I do to improve the world", and, understanding your own unique skills find a way to contribute them to the general well being of the both your community and the world.
There are other things that rather follow naturally from this, such as exposing oneself to new ideas, art, people and culture, to forge meaningful and hopefully lasting relationships, and to - very hopefully, find one's "tribe" in an increasingly fractured and diverse world. But start at the beginning and you'd be surprised at how things start falling into place...
I just saved you $20 bucks on some lame-assed bestseller, and 3-4 hours reading 50-100, 000 words of drivel that would try and tell you the same thing.