two different iClouds, how to merge the photos?

I have two Apple IDs, one of them is my original account that I had a problem with, and Apple Support told me to create a new one.

I pay storage in iCloud for both of that accounts.

The original one is in my old iPhone 7 Plus, that I have photos that I do not want to loose, from 2017 to 2020

The new one is in my current iPhone 14 Pro Max, that I have the photos from 2020 till this day.

I did not want to AirDrop the photos because, not only there are around 20K photos, which would take forever to do it, and also all the old photos would be in the recent page in the Photos app, and I don't want that.

Is there any other way I can merge the old photos in the new account/phone