How do I recover the Apple Developer Account Holder role? My organization’s account holder left the company. He used a private email address from his private domain when enrolling, so we don’t have how to take control of the email.

He is not denying transfer the account holder role to another employee, but he is taking a long time (more than a month now) to do that, which is weird.

Do we have another course of action?
The best course of action is to contact Apple directly and let them know the details of your situation. They should be able to transfer the account holder role, if they want. They would probably require a signed document from your CEO or similar.