Website Content Gone & Login Issues

I have had some issues lately with my hosting through Bluehost and recently ran into some issues with login for ww.wp.xz.cn and needed some help/insight ASAP.

Last week my all of my website content had disappeared after what seemed to be an auto-update with Bluehost and updating some plugins. I have been working with Bluehost to try and get a restore from a backup they had on their servers / CodeGuard (a paid service via Bluehost specifically for backups, etc.)

Both the Bluehost server backup and CodeGuard backup failed and my website is still currently how it was when all of my content had disappeared and it seems to be reverted back to a templated generic theme that I was initially using but then did not use to build from.

Thankfully, I have Updraft Plus and a backup that should have my content from February 7th. However, I am now running into issues with logging in to my WordPress account. I can login just fine if I am going through the Bluehost portal. However, when I try and login through the https://domainname.com/admin method, WordPress is giving me this error.

ERROR: There is no account with that username or email address.

I am using the same email address that I have always used and up until now has worked just fine. Does anyone have any idea why this might be happening? Or, can anyone provide helpful insight! I am very confused and terrified my website / login has all been messed up for some unknown reason.