Connecting Outside LAN

[EZFrag]

Hi.  I have a windows 11 computer running Jellyfin.  My internet comes in through an arris cable modem.  I have a TP - Link Deco Mesh network throughout my house.  While on my LAN, everything works great.  Smart TV's and IPads all see my jellyfin server.  But I can't reach it outside the network.  I had tailscale installed, but I have more family than their offer of free accounts, so I would have to subscribe.  Is there anyway I can set things up to access Jellyfin without having to use a reverse VPN?  What I recently tried is putting the Arris cable modem into bridge mode and port forwarding the Jellyfin server on the Deco Mesh.  I had attempted to port forward Jellyfin on the Arris Cable modem, but I got an error message saying the iP address was out of range.  Any suggestions would be appreciated.

Thanks,