Yes, you can signup from one user account and a organization account for your self.

You should have enough user licenses to added users to your account. From an administrator privilege account, navigate to Organization > Users, then add a new user.

All information that is relevant to the user account would be deleted however if the user is an owner of an organization or group, they would not be able to delete their account until they reassign it to someone else. If you would like to keep data of the user would like to delete but revoke access, you can Disable the user account.

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