First, know what you're really good at, ego aside.

How?

Do your personal inventory. A collection of the work you've done for clients and in your work life. Good and bad —the worst ones too, actually. Having that will give you a better glimpse of the big picture.

This is how you start seeing the hidden patterns in what you do and how you do it. How you actually helped. What your contributions and impact are. In the big picture, they're evergreen.

It unveils the deep you, your core and what moves you. Your —in words of Rochelle Moulton—'genius zone'.