I still think instances should be largely region based, which is why I started one for Colorado. As far as sharing it I’m not really sure either other than spamming it everywhere (which I also don’t want to do). Instance discovery kind of sucks, you can’t even search on the main join Lemmy page.

Assuming you don’t want to expose these services directly to the internet (I don’t recommend it) then you want to set up a VPN to connect back to your home network. Wireguard or OpenVPN are the most commonly used. As far as guides that will depend where/how you want to run it.