Please click on the links and read the documents -->
Change your Apple ID - https://support.apple.com/HT202667 - "Follow these steps to change the email address that you use as your Apple ID."
"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" Click on this link to read "What to do after [or before] you change your Apple ID email address or password" --> https://support.apple.com/HT204071
- You may wish to disable Settings > Find My before changing your information, change the information, then reactivate it with the new information.
Apple doesn't have a position statement on re-using email addresses but from reports on this forum it is generally understood if you have recently used an email address with Apple for another purpose such as a rescue email address it cannot be re-used immediately for another purpose.
About your Apple ID email addresses (was "Manage your Apple ID primary, rescue, alternate, and notification email addresses") --> https://support.apple.com/HT201356