Apple ID deletion

From the article post above.

What happens if I change my mind after I have requested that my account be deleted? 

While your request is being processed, you can contact Apple Support with the unique alphanumeric access code you received, and we’ll help you cancel your request. After your account is deleted, Apple can't cancel the request, reopen your account, or restore your data.

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You should promptly use the code you received after requesting the deletion to cancel it. If you don’t do so before it is processed, the deletion will be permanent.

How to delete your Apple ID account - Apple Support

Read the linked support article I included at the end of my post above.