“Ask yourself what makes you come alive, and go do that, because what the world needs is people who have come alive.” Various people have attributed this insight to Howard Thurman.
I suggest that you have a big YES! within you. If you look, you will find it. You know when you are aligned with it, when you are in your creative flow. And you know when you are not in it, when your creative energy, your desire to engage and contribute is being extinguished. It is your Yes!, and you are the only who can contribute it in your specific way.