If you’ve found a human prince you’re prepared to serve, nothing stops you from serving him.
I would be curious who concretely that might me.
And if you’re not serving him, why not?
There isn’t a real, functioning Christian monarchy in the world right now, that’s why. The Revolution’s victory is total. Even countries that have legitimate monarchs have succumbed to the Revolutionary virus.
Someday, God will raise up a Prince who will restore Christendom. Until then, I will respect the authorities He has placed over me — whomever they may be.