Each DataCamp account has its own unique progress and XP. If you did not delete your DataCamp account, then your progress may be associated with an account with a different email.
If you cannot locate a second account, you can contact DataCamp Support Team with the full name likely listed on the account and your subscription's payment information: Where is my DataCamp subscription?
Note: DataCamp cannot currently merge accounts or transfer XP, though you can swap accounts' emails.