@Anterio-and-Debbie0
The best way to handle this is cancel as the Host as soon as possible. This allows them to re-book those dates with another Host.
Airbnb will add a fine to you for the cancellation according to the policy below. Be sure your calendar is blocked moving forward and/or delist the property to prevent further guests from booking. I don't recommend permanently deleting until your taxes are done for next year. You'll need access to the listing to get the earnings information.
Host Cancellation Policies
https://www.airbnb.com/help/article/990
Unlist or Remove a Listing
https://www.airbnb.com/help/article/476