I’ve thought about it, and nobody will care about your/my elaborate setup after we are gone. It will just be replaced by a ISP router without regrets.

Is your domain zesfca.com?

You missed replacing your domain in this post, so I could try your site. It looks like your rewrite works fine, but getting the 404 here as well.

What happens when you run it locally? (hugo serve) Does it work?

Also, run: ls /var/www/mydomain.com/public/ if possible and share the results here. It should contain folders matching your site setup.

Calm down, no need to go crazy here

Also have a look at omnivore as a pocket alternative!