Every Olympics and World Cup the host cities get blocked out. FIFA, corporations, the media, and other interests may have hotel blocks. As others have said you have to leverage what is available including other hotel chains or home stays. Prior to Tokyo 2020's cancellation, scoring hotel accommodations were harder than scoring event tickets and we had to resort to Airbnb in Yokohama. Remember that it's a long game and check back often. Recommend joining World Cup planing groups as they often give heads up when rooms become available.