You can use this flake to add cosmic to your configuration
Tailscale makes it realy easy to connect your pihole remotely (it even has a guide on how to set it up here), and has the aded bonus that you can get it to point to your pihole’s DNS without having to touch any router settings if that has been an issue for you :)
Oh I love your wallpaper, do you have a link to somewhere I can download it?
Unfortunataly that may fall under metal