@TimeLime just one quick addendum: in your case I wouldn't edit/tweak TXT and MX records for your top level domain, since they're connected to Proton. But it's a good idea to ask in the forum what to do
@TimeLime no! Example: I use elenarossini.com for my Wordpress-powered blog (hosted outside of YunoHost)... but then I set up the subdomains photos.elenarossini.com for my self-hosted Pixelfed and videos.elenarossini.com for my self-hosted PeerTube 🤗