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VPN and port forwarding
(lemmy.dbzer0.com)
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These two form a "mesh VPN" which use direct encrypted links between any number of devices. You can think of it as forming a virtual LAN where you can communicate with devices, including open ports. A lot of them have clever tricks to overcome CG-NATs, which you seem to be struggling with.
Another option is to just rent a server. You can get massive storage space for less than some VPNs cost and you don't need powerful hardware if your device supports the codecs you're using. You could even get a cheapy VPS and reverse proxy to your Jellyfin server through an SSH tunnel or similar. Lots of options here.