If your subscription has expired, and you want to revert back to a personal account, there is now an option to convert all users in your trial subscription back to personal accounts. From the My Organization page, there is a button to do so. Your trial must be in an expired state, otherwise you won't see this button.
Any types of items that are specific to subscriptions will be deleted. Thus, if you created some web maps that reference hosted services, the layers that reference hosted services will no longer work.
Thanks,
Mike