To delete your organization, follow these steps:
Hover over your profile picture at the bottom left corner.
Click on Organization settings. Note that if you don't have the necessary permission to manage an organization, then you might not be able to see this. In that case, please get in touch with your organization owner to make you an owner.
Click on Delete organization card.
Provide your feedback. It's optional.
Click on Delete organization.
Confirm the deletion.