The current strata manager is not renewing their management contract, and there is apparently conflict among the owners and among the strata committee members. This situation is likely to make it hard to recruit another strata manager.
But the strata manager appears to be doing the right thing, and if your building has a standard management contract with him, then it is likely that manager is legally performing their proper duties.
Keep in mind that your Owners Corporation has to appoint a new strata manager (if they want to do so) at a general meeting. In your situation, the Annual General Meeting is able to be held, and so that is a sensible time to do so (a general meeting can be an extraordinary or an Annual general meeting – they are the same kind of meeting, but at an AGM there are some specified items that have to be included on the Agenda). It makes sense to only hold one general meeting, as the strata manager charges the OC for holding a meeting.
There can be an agenda item to engage a strata management company at a general meeting. But it seems the current manager does not want to take this on any more, and so the owners will need to get (ideally) 3 proposals from other strata managers to consider. Usually this is done by the strata committee, which is currently not functioning (without the necessary quorum, now that you are the only member, so the OC cannot make any decisions – tho the Secretary can schedule meeting, but that is not the purview of a Treasurer), so electing a new strata committee, which must be done at an AGM, is a priority.
It appears that the proper steps are being taken. If you want to speed things up, you (and other owners) could arrange to get 3 proposals from strata management companies, which can be tabled, and considered, at the strata committee meeting that is normally held right after the AGM, with the new committee members. But another general meeting will have to be held, arranged by a functioning strata committee, to appoint the strata manager, although that can be a “paper” meeting, utilising emails or ZOOM, to minimise costs.