

See to what IP your domain points, and if that’s really the external IP of your router. Might also help to put in your IP address into the webbrowser instead of the domain, to see if port 80 / 443 really go somewhere. Another possibility, do a portscan from the internet.
Btw, how do you access Wireguard? I mean that’s also somehow able to access your network from outside…
I’ve always backed up my SMS to my E-Mail inbox. With something like SMS Gate or SMS Backup+. I think it’s nice to have all messages in my mail program. Of course that only does one way. To reply and get immediate notifications, I use KDEConnect (or GSConnect which is the same thing for GNOME.)