To say you are the best in the world means something serious. It means that of all of the people on earth, you exceed them in your discipline. 10 out of 10 people could challenge you from any part of the world at your discipline, and they will lose.
With that being said, can you truly sit there and say you are the best in the world at your job or craft? Can you at least say you’re close?
If not I’d suggest you start putting in the work to become the best.