You are able to change your primary domain name on your account to one of your add-on domains. Letting your current primary domain name expire wouldn't affect your access to your add-on accounts, and you could continue to directly access them via their domain names, or by using the server's own shared hostname (ehub26.webhostinghub.com).
If you would like to go ahead and swap your primary domain name with another add-on domain on your account, please review the following article that discusses the impact of this. Then you can follow the instructions at the bottom to submit a support request to have this done for you:
How do I change the primary domain on my account?
I hope that information was helpful. Please let us know if you had any other questions at all.
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