can i change my apple id to a phone number from an email i no longer use?

See this Apple article: Change your Apple ID

Change your Apple ID - Apple Support (SG)

• In some countries or regions, you can use your phone number as your Apple ID. But if your Apple ID is an email address, you won't be able to change it to a phone number.

Then see this Apple article: What to do after you change your Apple ID or password

What to do after you change your Apple ID or password - Apple Support