If you try to browse to the tailscale website does it work?
If it does you could setup tailscale with an exit node at your house and tunnel your connection that way? Everything would then be coming from your home internet. I have had good success with tailscale being able to punch a hole through some pretty filtered firewalls.
+1 to this used to use it and has all the wine packages pre installed so its super simple to setup lutris. I’ve since needed to go back to Windows just because there is no AMF encoding support for sunshine on Linux AFAIK