Stop all aws services

If your EC2 instances are stopped you won't be charged for any compute resources (since they aren't using any) but the EBS storage volumes are still billable so long as they still exist.

If you want to find out exactly what it is that is accruing a charge, scroll down to the foot of the right hand pane of https://console.aws.amazon.com/billing/home#/bills and it will show you everything that you're running in the current month that is billable, even though the total you may end up being charged could be zero if you are still in free tier.

Expand each section and drill down to see which region(s) you are using resources in.

AWS Cost Management can also give you a view on this https://console.aws.amazon.com/cost-management/home#/dashboard

Detailed advice on terminating resources you don't need any more is here https://repost.aws/knowledge-center/terminate-resources-account-closure

A drastic option if you want to terminate all running resources is AWS Nuke (caution: use with care!) https://docs.aws.amazon.com/prescriptive-guidance/latest/patterns/automate-deletion-of-aws-resources-by-using-aws-nuke.html

There are tools like aws-nuke which will help you to cleanup your account.

Try this out and lets see if it works Open the Management Console, select the region in the navigation bar where you have any unwanted resources. Enter each service name in the search bar to open its dashboard. Terminate any unwanted resources. Note: Remember to terminate unwanted resources for each region. Terminating resources in one region will not lead to termination of those resources in other regions.