How can I change my Apple ID email address?

see this on how to change your Apple ID primary email

Change your Apple Account primary email address on your iPhone or iPad

1. Go to Settings, then tap [your name].
2. Tap Sign-In & Security.
3. Tap your primary email address to make changes.
4. To remove this email address from your account, tap Remove from Account. If you want to keep the current email address associated with your Apple Account but change to a different primary email address, turn off Primary Email.
5. You’re prompted to choose another primary email address. You can either choose one of your other email addresses associated with your account as the new primary, or add a new primary email address.
6. Follow the onscreen steps to enter and verify your new primary email address. Learn what to do if you didn’t get the email.

The support article Change your Apple Account primary email address - Apple Support outlines various methods for changing the email address (Apple ID) you use for your Apple Account while retaining everything in your account. If you have an iPhone or iPad running iOS 18 or newer, read the support article for instructions how to do this.

If you have an older iOS/iPadOS, Apple no longer provides the instructions for that, but here they are:

1. Go to Settings, then tap your name.

2. Tap Sign In & Security.

3. Next to Email & Phone Numbers, tap Edit.

4. Tap the red Remove button next to the email address, then tap Delete.

5. Tap Choose Another Email Address and enter your device passcode if asked.

6. Enter the new email address, then tap Continue.

7. Enter the verification code that was sent to your new email address. Read this support article to learn what to do if you didn’t get the email —> If you didn’t receive your verification or reset email - Apple Support

8. If you encounter issues with certain services after doing this, this outdated support article may still have useful suggestions --> What to do after you change your Apple ID or password - Apple Support