It helped me for some reason to state my purpose in past tense as if I am already gone. Strange.
In that sense, my tombstone Life Purpose is:

Here lies That Screenwriter who spent her life as a living example of a writer who creates fearlessly and moves people deeply.
Her life currency was discomfort.
Each day she was willing to pay with dedication, thought management, determination, and careful choices to tell the most moving stories, look her best, feel her best, and become the most that she can be.

Am I purposing right?

That Screenwriter