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Well, I don't have an answer to that dear.
Maybe the best people to ask this is the successful ones you think are unbelievers and know if they discovered their purpose and how they did it.

@fayour I don't think finding purpose is the ultimate recipe for success and also some people just know what they are made for. Believers or not, they just know

How do you become successful when you don't know what you were created for?

In my opinion You could become successful just by doing the right things, even if that's not what you're created for.