Check out the Supported DB engines for DB instance classes section on the Amazon RDS Documentation and ensure whichever DB engine you are using is supported by the db.r4 instance type. For example, if you're using PostgreSQL, the db.r4 is only supported on lower than PostgreSQL 13 engines.
You can also check under the Availability and durability section when creating a new RDS instance. If you're attempting to create a Multi-AZ DB Instance or* Single DB Instance*, you'll see the db.r4 instance type available. That changes, however, if you instead select Multi-AZ DB Cluster due to supported architecture.
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