Apple id
How to start from scratch using the same apple if but get a new email tied to it and delete the old one? Also any apps using Apple ID , how do I opt out from using them
iPhone 11, iOS 15
You can change your Apple ID email address on your current Apple ID so you retain access to your data and prior purchases. Note the restrictions in the article.
Make sure you turn off Find My Phone before signing out of the old ID. Once signed out and Find My Phone is off, then sign in with the new ID, then turn Find My Phone back on.
What to do after you change your Apple ID or password - Apple Support * I suggest doing this before you change your Apple ID or password.
For the apps, either sign out of the app or delete the app.