Apple ID email no longer associated with my Apple ID

See If you forgot your Apple ID  https://support.apple.com/en-us/HT201354;

If you forgot your Apple ID password https://support.apple.com/en-us/HT201487; and

 If you forgot the answers to your Apple ID security questions https://support.apple.com/en-us/HT201485

You also can use Having trouble signing in/iForgot https://iforgot.apple.com/password/verify/appleid to identify either or both of the first two.

If you are not successful using the links given above, then see: 

Security and your Apple ID https://support.apple.com/en-us/HT201303.

This document says “without proof of your identity via security questions and other carefully selected criteria, Apple Support can't help you reset a password or perform any other actions on your account.”

Thus, if you have not been successful, we can do nothing to help you, except to mention that Apple support might help you if you have an extenuating circumstance (e.g., you have the receipt for your purchase of the device with its serial number on it or a court order instructing Apple to assist in the provision of access to a decedent’s information from the deceased person's accounts. See How to request access to a deceased family member's Apple accounts https://support.apple.com/en-us/HT208510. 

if you want to contact Apple support to discuss an extenuating circumstance, see these support options:

Get a call from Apple support to help solve your problem using this

link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

Apple ID Support https://support.apple.com/apple-id

Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best support option. 

Did you acquire the apps you mentioned under the old Apple ID? If that is the problem, then try using the heading Before you change your Apple ID from here https://support.apple.com/en-us/HT202667

and What to do after you change your Apple ID or password https://support.apple.com/en-us/HT20407.

A request for another Apple ID password is often caused by updates to apps/purchases that were made when using the other ID. Those purchases are tied to the other ID and can't be transferred. One option is to delete the apps/purchases made by the other ID and download them using the new ID if desired. If necessary, check your purchases history to see which apps/purchases weren’t made by the current ID. 

Purchase History Review.