Migration with two Apple ID's
I have an old iPad that I am replacing with a new iPad. I'd like to migrate data and apps from the old to the new iPad. The problem is that the old iPad is signed into iCloud with an old email address for which I do not remember the password, and cannot receive messages. I have created a new Apple ID with my current email address that I will use on the new iPad.
What is the best way to migrate apps and data between the two iPads and iCloud accounts? I have no ongoing use of the old email/Apple ID.
Thank you
iPad mini 5 Wi-Fi