Opening a port doesn’t mean you are opening your whole home network just the specific services you want.
until a new high severity vulnerability gets discovered and some bot exploits it on your server, taking it over. and you won’t even know. if they were a bit smart, you won’t notice it ever either.
but there’s more! its not only the reverse proxy that can be exploited! over the past few years, jellyfin has patched a dozen vulnerabilities, some of which allowed execution of arbitrary system commands. one of the maintainers have expressed that nobody should be running those old versions anymore, because they are not safe even only on the LAN. and this was just jellyfin.
I thought that was a modified power supply