If that question seems too vague, consider:
- What did you not know at the start of your PhD but know now?
- What can you do now that you couldn’t at the start?
- What were the false starts and dead ends that still helped?
- What can you pass on to others?
- What can you do to keep building on your talents?
A thesis has to have a significant, original contribution to knowledge. I think a PhD graduate has to have made a significant change in themselves to complete. What’s yours?