How to change RDS T2 to unlimited

Hello

Amazon RDS T4g and T3 DB instances run in Unlimited mode, which means that you will be charged if your average CPU utilization over a rolling 24-hour period exceeds the baseline of the instance. CPU Credits are charged at $0.075 per vCPU-Hour. The CPU Credit pricing is the same for all T4g and T3 instance sizes across all regions and is not covered by Reserved Instances.

Check information here https://aws.amazon.com/rds/mysql/pricing/

Thanks