Can’t get signed into email on old account

I am a current subscriber but under a new account. This question is specifically referencing an old account. 

we closed an xfinity account at our old address when we moved four months ago. All of a sudden tonight at midnight my email program started popping up an incorrect password for imap account alert. I tried to sign in via the website and it wants me to reset my password. I try to reset my password and it wants me to connect to my home wifi. Since the email address is from my old account, I assume it wants my old WiFi, which does not exist. So I can’t login to reset my password, and I can’t reset my password to get logged in.

The fact that this started happening makes me wonder if my email address was purged. I definitely logged in on the website within 90 days after the xfinity account at my old address was closed because I was trying to purge a bunch of old emails and it was easier to do on the website. I got no warnings from xfinity/comcast warning me that my account would be purged - the email address is like 20+ years old. My entire life is in there. I would’ve taken steps. 

what do I do? Does it sound like my email address has been deactivated? Can I get it back?