To delete your organization, access the Organization Settings. Simply click on your profile picture in the lower left corner and select the option "Organization Settings". Now, the settings of your organization will be displayed.
Deleting an organization
After clicking the more button (symbol: three dots) next to "Organization Settings" and selecting the option "Delete this Organization", a password query will pop up, asking for consent to delete all data.
Warning: If you confirm this query, all data of your organization will be irrevocably deleted and cannot be restored.
Dialog box to confirm the deletion process