Bear with us on this one...
Obviously aspire to be amazing at what you do, that's a good goal to have, but what we mean is - be good a various different skills in music. Find your weaknesses and improve them. Outsource from experts or people that are better than you, and learn from them. That's the best way to progress and make a living from music! Find your expertise, but also develop your other skills. It's equally as important.