Two possible reasons come to mind:
The region / AZ you're trying doesn't have any t2.micro RDS instances available. Try a different AZ or different region. us-east-1 is usually a good bet
It could be that the free tier offering hasn't kept up with the RDS instance availability. Nothing you can do about this.
If you delete your Google Workspace account, it will delete your Organization and all resources associated with it. Therefore, if you want to delete your Organization, you can do so by deleting your Google Workspace account. For Cloud Identity users, cancel all other Google services, then delete your Google account. This is potentially a very damaging ...