I want to start with self hosting something available from internet. Currently I have jellyfin, nas etc but everything is available in local network.
My biggest concern is securing local network. I thought i will run application on separate server, I will use small vps as proxy, but Im not sure if it will be enough


Separating LANs doesn’t really do much in terms of the wider internet. An adversary would likely be more interested in your internet connection than anything else.
I personally would stick to using a VPN