Create a cross-Region read replica of the database in the secondary Region and configure an AWS Lambda function in the secondary Region to promote the read replica during a failover event.

In the primary Region, establish a health check on the database that triggers an AWS Lambda function upon detecting a failure. The Lambda function should then recreate the database from the latest snapshot in the secondary Region and update the Route 53 host records for the database.

Develop an AWS Lambda function to periodically copy the latest automated backup to the secondary Region every 2 hours.

Set up a failover routing policy in Route 53 for the database DNS record, specifying the primary and secondary endpoints in each respective Region.

Create a hot standby database in the secondary Region and utilize an AWS Lambda function to restore the secondary database to the most recent RDS automatic backup in the event of a primary database failure.