CameraGreenBlack

Yeah maybe I didn't see that comment (in fact don't see it still). Unfortunately, you can't expose a service to others behind a NAT. You can either get a cheap VPS and do some reverse tunneling (the speed with which others load Jellyfin will be limited by your personal upload speed), or get a slightly expensive VPS and host Jellyfin on it.

Are you behind CG-NAT ? An easy way to check this is if the IP address reported by your router is different from your public IP.