Consolidate email addresses
I have too many email addresses, how can I get every email to a primary address?
iPhone 11, iOS 16
I don't think that is possible although you can consolidate multiple email accounts to one presentation using the Mail app. I know on my iPhone I can see both of my email accounts as a single list. Just set up your multiple addresses in the Mail app and have your display set to show all inboxes.
Add an email account - Apple Support
The other things you can do which many service providers have as a feature is mail forwarding. In fact one of my email "accounts" is only a forwarding service. You can send email to me there but all it does is forward it to a real account. How you do that depends upon the provider.