Purpose is really hard to create. We all tend to have some passion, be it music, art, sports, etc. Over time, passion tends to fade and we may eventually give our passion up. Passion is inherently fleeting. However, driven an intrinsic motive for the betterment of others and coupled with perseverance, I believe that's when passion turns into purpose.

Passion + Perseverance + Helping others = purpose

Cheers!