@Kathryn446 , I empathize with your situation. That amount of money is far from negligible. I had a similar amount on the line too.
Did you exchange with the host through Airbnb messaging? If yes, and I hope it was the case, please share a screenshot of the exchange with the customer support representative.
In the heat of the pandemic cancellations, support asked me if I could wait 5-7 business days to give them a chance to deal with the most pressing cases, which I did. Once they could find time they started looking into my case, and within another 3-5 days the matter was resolved.
I had reservations with two hosts. One host confirmed the refund to the customer rep within minutes, the other host needed some reminding and convincing from the customer rep supervisor.
One note on the host that needed some reminding: I had stayed with them in the past and they were excellent and super hospitable. The wave of pandemic cancellations hit people differently. Hosts lost a lot of business and I understood the reticence in issuing refunds due to not fault of their own. Hence, my appreciation that they ultimately did the right thing. I would stay with them in the future when the opportunity presents itself to make up for the their lost income.
Good luck!