How do you cure the problems of the world?

Ask the first question, before asking any others.

What are we?

Before you can ask what is your purpose, you must ask," what are we?"

Would you use a hammer to cut a loaf of bread?

Is that because you know that this is a hammer?

No one in all of human history has ever scientifically proven definitively what we are, much less whether we are real physical forms, or a holographic image inside a computer. We don't even know why we sleep much less what we are.

So how can anyone say that our purpose is to serve a God much less which one, or that we need to find ourselves or we need to be part of society, or we need to lose weight, or we need to be wealthy, or we need to be of service to society, or any of those other statements that we so often hear?

How can we answer any question about our purpose in life without answering the first question, 

"What are we?"