How do I prevent my custom font from reverting? Still displays correctly in the editor.

Site URL: https://clover-red-szea.squarespace.com/

Hi, I've been searching for hours but haven't found an answer. 

I was able to get this font to display correctly across all platforms, but it reverted today. I am on Avenue in 7.0 and my site is here https://clover-red-szea.squarespace.com/ . I'd like the same font site-wide. 

Code:

@font-face {
    font-family:('dos');
       src: url('https://static1.squarespace.com/static/5f29ed1621fef95eed4c2fe1/t/5ff4c1056eecec7adc4bbf3e/1609875717957/MorePerfectDOSVGA.ttf');
  }
h1, h2, h3, p, a, body, .project-title, button, #topnav nav ul li a, input, select, textarea, topnav, mobilelinkmenu, projectpages, projectthumbs, mobilenav, {font-family: 'dos', !important;}

div#mobileNav *, div#mobileMenuLink a {
    font-family: dos;
}

Well, when things go wrong I say start from the beginning and make sure all steps are correct:

https://junemango.com/post/adding-custom-fonts-to-squarespace

Have you solved this yet?