From what I've seen, it's also not possible to remove yourself as an admin of an organization, via Dashboard.
I'm unsure, however, if it's possible via API.
But as @BrechtSchamp correctly states, in order to delete an organization, you'll have to go through of the process of removing devices from networks, unclaim devices from inventory, deleting networks, removing all admins other than yourself _before_ you'll be able to delete an organization. Same goes for Dashboard as for API.
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