Using the Harry Potter Fan Club app, anyone who has previously been sorted on Pottermore will be able to re-take the Sorting Ceremony and discover their Hogwarts house. You’ll be given the option to either stay in your current house or swap to your new house (if you get a different result). After that, you can retake the Sorting Ceremony as many times as you like – but the Sorting Hat won’t change its mind.
You will not be able to take the reimagined Sorting Ceremony on WizardingWorld.com if you have already been sorted on Pottermore.com.