@Nermín0 You mention that you booked a year out. As in March this year. The pandemic was already in full swing, with your own PM succumbing in late March. So you took a risk, knowingly, and now one that may have backfired.
Nevertheless, I agree with @Anonymous that you should negotiate a date change, both with the airline and your host. Just don't take no for an answer. Call them back and insist on a date change. And make sure you take out travel insurance (the cancel for any reason type) if you do manage to rebook the dates. It's somewhat unusual for an airline to be cancelling scheduled flights 5 months out so definitely follow that up.