It's not illegal to use VPN in my area, but connections are blocked on a protocol level, both through OpenVPN and Wireguard.
I already managed to make caddy work, so, hooray!
I also found a setting on my router that fully isolates certain devices from the local network. I want to put the server in there, so that the rest of my LAN is not under threat. I also want to figure out VLANs.