You are missing the point here. Rescheduling your flight will not work. Even if your airline is still flying the route, the ban is applicable at port of entry. Border is closed for non citizens and non pr.
So regardless whether you airline cancels the flight or not, you will be denied entry at the Canadian airport.
Silver lining: For all of us first time landers, the condition within Canada is less than ideal at the moment. Starting a new life for an immigrant is difficult even during normal days, imagine what it would be like during a state of emergency. No jobs, no hiring, difficulty finding accomodation, no supplies at supermarkets.
Think of the ban as something positive and temporary saving us from a potentially worse situation to be stuck in.