Do you know if your assets were with the public cloud or in a private cloud?
If they were in the public cloud and the assets were your property then you should be able to switch emails linked to your old Adobe ID, you will need to log on with your old email and password and then manage your account:
1) Log in with old account and password:
2) Click on your name next to your avatar in the top left hand corner
3) Click the Manage Account button
4) Login in again with the old account and password
5) Click on the gear wheel (account) tab
6) Underneath the Adobe ID section change the Adobe ID email