I’m sorry, but the epizy.com domain is being sunset so it’s no longer possible to create subdomains with it. This includes creating subdomains on accounts you’ve owned before.
I’m surprised that this domain could be impacting your SEO though. As far as I can tell, you briefly had this domain on an account in 2016, had it for a few months, then it was inactive and finally it was deleted. For the almost seven years since then, the domain appears to have been unused.
Can you please explain a bit more about how a subdomain that existed for three months seven years ago is impacting your SEO today?