Paraphrased from Jack Canfield,
"Your passions are your purpose. You don’t want to spend your whole life climbing a ladder leaning against the wrong wall."
How do you know if you’re on a ladder against the right wall?
Ask yourself - how do I define success? It may be different than the person next to me. Your definition of success may not have to do with making the most money, or even having a job that fulfills you in every way. We can find passion and purpose in many ways.
What gives you joy? What gives you glimpses of knowing you're doing exactly what you're supposed to be doing?
It doesn't have to be your career - it could be a side project, hobby, or activity. For me, it's helping athletes transition to life post sports career. I don't know what this will morph into, but I do know this is what I'm supposed to be doing :)