What does count as "something new" in the field for PhD?
Your thesis committee, and your supervisor in particular, are the ones who decide if your research is sufficiently novel.
Make sure they are happy and seek their guidance if they are not. It seems your supervisor isn't happy, so work with them to find what you can add or what other direction you can take. You could provide a StackExchange answer with dozens of upvotes saying your work is a novel contribution and it won't get you closer to graduating.