The owner of an organization can transfer ownership to any other admin in the organization.
To do this, go to the Organization Settings section.
Under Account Info, click the Transfer ownership button and choose an admin from the list. Click Confirm to complete the transfer.
Check the Org Chart to see the new owner of the organization. They will now appear at the top of the chart.
After you transfer ownership, you will lose access to the Account Info tab in the Organization Settings section, as only the owner can access that tab.