Usually under a strata management agreement, the functions of the chair, secretary and treasurer are delegated to the strata manager.
That takes care of the day to day running, but the strata manager is not delegated decision making powers by the act.
So either the committee gets its act together and holds meetings and makes decisions, or the strata manager conducts an endless serious of general meetings to get decisions made.
If none of thst works, someone can petition the tribunal to appoint a compulsory manager.