Cross Region Failover + Geolocation Routing

I have deployed two instances fleets on 2 different regions behind ALB which run same application, I have configured Route53 geolocation routing policy to route traffic of users in a region to the instances in that region, now what if one of the region goes down, the users in that region will face down time, is there a way to redirect traffic of that region to another region in case of region downtime?