Game Center enter nickname

Hello zs123,

Looks like you created a new account to change your Game Center name and want to switch back. We can definitely understand your concern and are here to help. We recommend signing back into the old Apple ID that was associated with the Game Center account you was previously using. Check out these steps on how to do so:

On your iPhone, iPad, or iPod touch

1. Open Settings. Scroll to Game Center, then tap it.
2. If Game Center isn’t on, turn it on, then sign in with your Apple ID.*
3. Tap the Nickname field to enter a name that your friends will see when you play games together. If you can’t think of a name, you can choose one of the randomly generated suggestions.
4. To personalize the picture that shows with your nickname, tap Edit in the circle at the top of the page. From here, you can create a Memoji, use an existing one, or customize how your nickname's initials appear.

If you see a nickname or other information already set up, you might already have a Game Center profile. To verify that you're signed in with your Apple ID on your iPhone, iPad, or iPod touch, go to Settings and look for your Apple ID. To verify that you're signed in with your Apple ID on your Mac, choose Apple menu  > System Preferences, then click Internet Accounts and look for your Apple ID in the sidebar.

For additional information, we recommend checking out this link: Use Game Center to play with friends - Apple Support

If you forgot your Apple ID email address we recommend checking out this link: If you forgot your Apple ID email address or phone number - Apple Support

Let us know if that helps and kindest regards!