Database v5 on RDS

To estimate the extra charge for continuing to run a version 5 database on Amazon RDS, consider factors such as the database engine type, instance size, region, storage and I/O usage, data transfer costs, license model, and whether you opt for reserved instances. Use the AWS Pricing Calculator with your specific details for an accurate estimate.

Additionally, you can refer to this previously posted answer, which explains how to estimate the additional costs: Estimated Charges for MySQL Extended Support.