user does not exist | WordPress.org

I created a new projectdmc.org account so I could login to this forum and get some help. I was working on my website in wordpress, uploaded a new pdf to link, went to test the link and it didn’t work. This was after I (think) I updated to 6.1. I then clicked on some links and started receiving ‘site maintenance underway, please check back again’ or something close to that. Then the message switched to ‘there has been a critical error on this website’. I could not get to the editor anymore. I then went to re-login to wordpress with my username areich and it says ‘user does not exist’. So now my website is down and I have no idea how to even get into the site editor to try and troubleshoot.

The page I need help with: [log in to see the link]

 

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