Is it possible to enable HSTS on the server?
fix for what exactly ?
Have you tried it? Going for the A+ on the SSL test? 
lol yup, and yeah I did it! Success! A+ 
I also edited some stuff to increase security. if you scan on this website : https://www.htbridge.com/ssl/
there is a section at the bottom of the page which has some tips to improve your server security a little bit.
No need to use certbot when you can use the built in LetsEncrypt installer
sudo su box install letsencrypt
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It’s my go to every time I’m using QuickBox - for nonQB servers I do use certbot though - it’s just too handy!
I managed to get this installed, thank you for the guide. I just have one issue. What would be the equivalent of this line but for Deluge?
sed -i "s|DocumentRoot /var/www/html|DocumentRoot /srv/rutorrent/home/|g" /etc/apache2/sites-enabled/000-default-le-ssl.conf && service apache2 restart
Since Deluge is going to be my main client I want to set it up under ssl the same as rutorrent. Thanks!
Found the info myself here so leaving the reply in case someone else needs it: Get other programs on QuickBox to use LE certs