How to keep a contract once the design & implementation has been done?

Hi, I'm a junior network engineer, and I've been handed over a project that is 90% done by a senior guy. The network design has been done, and the implementation is almost done. I'm doing some small config changes and AP installation. What can I do to add value to the network and make the client renew my contract? Should I implement some automatisation stuff? Or review the network and see what can be done better/upgraded?