Regardless of whether or not you want to continue with your current manager, you should give notice that you want to terminate the (unsigned) contract. Then you can decide whether or not you want to renew that contract, renegotiate the terms, or find someone else entirely.
Doing nothing is an option but it’s not a good one.
By the way, all owners are part of an Owners Corporation (body corporate in Victoria) by default. I think you mean the strata committee