How can I freeze (not close) my account?

Hi. There is no freeze status at AWS account so to minimize fees, the way is deleting all unnecessary resources and do not use that account. Check unnecessary resources from console and delete them.

You may find billed resources by following the link.

https://repost.aws/knowledge-center/check-for-active-resources

Note: Once you close account, you cannot resume account after 90 day from closure. And If you resume within 90 days, you will be billed for resources up to the date you closed.In addition, once you closed AWS accont you can not use same Email address to new AWS account.