There are two main outputs from a PhD programme: a thesis and a person.
It’s easy to see what’s new in a thesis perhaps; less easy to see how a person has changed. Take time to explore your qualities as you get closer to the viva. A useful resource might be Vitae‘s Researcher Development Framework. It is partly a breakdown of all of the skills and attributes that an effective researcher might have, but there are lots of supporting tools for making sense of them too.
What can you do now that you couldn’t before your PhD? How are you now more skilled? And what are you going to do with your talents and skills when your PhD is over?