A friend introduced me to a poem by e.e. cummings (1894-1962) that has stuck with me over time:
"To be nobody but yourself in a world which is doing its best, day and night, to make you everybody else means to fight the hardest battle which any human being can fight, and never stop fighting."
I think in our culture we focus a lot of attention on being the best basketball player, or the best pianist, or the best designer with all of the attention being on the mastery of technical skills alone. The status of "the best" at something will be achieved by a very select few, making it nearly an unattainable goal. There can be only one "the best" at something.
But the thing we can each be the best at is being who we are. You alone hold the power to be the best you you can be. No one else can do that for you. The world needs you to be richly and authentically you if you want to leave a meaningful legacy. And you need you to be richly and authentically you if you desire joy, purpose and meaning.
Be you today. And be the best at it you can possibly be!