There are many ways to think about your thesis’ contribution.

Instead of coming up with a list of things you’ve done, start with why others might find something valuable in your research. What might they value? What would help them? What do they now know as a result of what you’ve done?

There are lots of things that could be valuable in research. Don’t compare your diamonds to other people’s. Look at why your work shines. What makes it valuable? What makes it special?

(you, for one thing)