Can’t Access WP-Admin Page

My site https://disasterrestorationaz.com has been active for years. I was able to access the control panel two weeks ago. Today I cannot gain access to the /wp-admin page. When I use this URL https://disasterrestorationaz.com/wp-admin/ I get a 404 error.

I have looked at some other people’s posts that seemed to be similar and I took these actions:

disabled all plugins
disabled current theme
deleted htaccess files

Still no luck. I need some help with this. Thanks in advance.