There is a process around committee elections and I suspect it hasn’t been followed.
Firstly you call for nominations
Then you decide how many you want on the committee.
Then if the number of nominees exceeds the number of vacancies. You have an election.
To correct this, you need to call an Extraordinary General Meeting,remove the strata committee and have another election at which you do things properly (and get yourself re-elected).
I think a committee of five is way too many for a nine-lot scheme (where the owners only take an interest after the matter). All it takes is for three people not to turn up for a meeting and it would be inquorate. Three e=would be a much better number.
As far as the strata manager is concerned, they will have a contract that spells out how long they are employed for and the terms under which they can be terminated. You might find it’s very hard to replace your strata manager before their term is up, unless they have breached the terms of the contract.