Just follow what JJeffrey says. You can cancel online or on the phone. You do have to call Reservations to get your miles redeposited, but you can do that later.
"We’re giving you more flexibility with waived award reinstatement and change fees for awards booked by May 31, 2020, for travel through September 30, 2020."
https://www.aa.com/i18n/aadvantage-p...am-updates.jsp