What to do after [or before] you change your Apple ID [email address] or password - https://support.apple.com/HT204071 - "After you change your Apple ID email address or password, you might need to update your sign-in information with any Apple services you're using." - Or if you're seeing persistent disabled messages or repeated requests for the password to your previous Apple ID. You may also wish to turn off "Find My" before changing information and turn it on again afterward.
If you actually created a new account instead of changing the ID on the old one you will have to delete any apps purchased with the old ID and re-download them with the new ID or use Family Sharing to share them with yourself.