As the secretary of a strata committee in an apartment building with a lot of repairs and maintenance required currently, I can confirm it is really hard at present to get tradespeople to provide quotes. The smaller the job the less interest. I presently approach about 5 companies for a job, with the hope of getting 2 or 3 quotes. Usually a lot of the companies approached do not even reply.
So the partial solution to your problem to to arrange 2 quotes yourself, and provide those to the strata manager and strata committee. Advise the manager you are doing this, and that may well speed them up. But otherwise, arrange the quotes, and advise the tradies that the quotes are being referred to the strata manager and committee once you get them. The strata committee at worst will end up with 2 quotes (which is now legally required for big jobs), and at best have 4 quotes.
While you are doing this, check the strata AGM minutes and the minutes of strata committee meetings. You should see your problem as an agenda item in the SC minutes, and in the AGM minutes check the building’s financial position and budget. Does the building have the money to make your repairs, or will it need to hold a general meeting to raise a special levy? A strata committee cannot sign off on a big expenditure unless all the money is in their back account, so a shortfall in levy income could also be a sign that there are other factors delaying your repairs… If your problem doesn’t appear in strata committee minutes, and if there are budgetary problems, prepare for a more complicated outcome…