What message would you add to the end of your thesis?
You don’t have time to do every follow-up, or advance every idea. Perhaps you can leave that to someone else. Perhaps there is a new perspective that you have on the whole work, and a short note could set those thoughts out. Maybe there is a problem with something in your thesis, but you don’t quite know how to talk about it on the page. Or it could be that you just want to thank some people.
Reflect on your thesis. What postscript would you add?
PS: Now you’ve reflected on this, consider making some notes or even writing a message. Your examiners are unlikely to ask you anything like this directly, but this kind of reflection and review is useful to see what you think about your thesis now it’s done.