At this time, you can only create an organization when you initially create a Couchbase Cloud account.
Refer to Create a Couchbase Cloud Account.
To completely delete an organization, you will need to do the following:
This ensures that there are no remaining resources left that can accrue costs in Couchbase Cloud or in your cloud provider account.
Contact Couchbase Cloud Support
The Support team will help you settle any remaining billing obligations and then delete your organization for you.