Welcome and thanks for dropping by the Community, @f-re.
You're referring to deleting or cancelling your QuickBooks Online (QBO) account, correct? If so, please refer to the steps below:
After that, an email confirmation will be sent to the account administrator for the cancellation. For more information, consider checking out this article: Cancel your QuickBooks Online subscription.
In case you want to resubscribe again, refer to this article for further guidance: How to resubscribe or reactivate QuickBooks Online.
Please let me know if you have any other concerns in the comment section below. I want to make sure everything is taken care of for you. I'll be here to help. Have an amazing weekend!