Actually, it's not possible for anyone to become the best in the world at something. By definition, only one person can become the best. It is possible to become very good at something, or even two or three things if you want. Expertise is relative. In some communities in which I live I'm the best in certain fields, but if I travel somewhere else this might not be true. Being the best is also temporary. No one will remain the best forever.
It's more important to follow your enthusiasms and passions. This might well lead you to become an expert in your field anyway.
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