In September 2018 the private story function was removed and any story part that was previously marked private was set to draft. In order to republish your story, it will need to be published again and it will automatically be set to public.
This is an effort to improve the performance of the Wattpad platform. At Wattpad, we're continuously looking to optimize the overall Writing and Reading experience and we appreciate your cooperation with this.
The Wattpad Support Team