My iTunes is disabled how do I change it back

This is primarily a user-to-user support forum; other Apple users like you. You will need to contact Apple Support. The following Apple Support article includes a link that you can use to contact Apple Support: If a message says 'Your account has been disabled in the App Store and iTunes' - Apple Support

When "your account has been disabled in the App Store and iTunes," there is an issue with the payment method.

In this case, I recommend contacting Apple Support for help from an Apple advisor.