How can we put our strata manager on notice?

Hi, new here, first post is a question.

I’ve looked around Flat Chat and am of the opinion our Strata Manager of three years is not doing enough, not even the bare minimum, to keep the strata operating smoothly. (Sydney, 42 units, 6os block.) Everything is delegated to him, the strata committee do nothing. This manifests itself in a range of ways from not maintaining or cleaning properly, to not documenting approval and giving residents notice of works affecting us all; including works affecting common property.

My question is simple. Our AGM is coming up. How can a few concerned resident owners ‘put on notice’ the strata manager and incoming committee that things need to change. We need to head off the ‘broken window theory’ situation we find ourselves in. The quality of life  here has detonated. Do we need a by-law or just an item on the agenda? Or just get ourselves on to the committee (again) which may not be easy.