Mhh I don't know if I can help you too much.
I initially followed spaceinvader ones tutorials for my unraid machine. But with time I changed from swag to nginx proxy manager. And I changed from using a duckdns docker to a router based dyndns tracker.
But honestly I don't remember too much from the process I currently try to switch domain but just can't get them to work :D so I am in a smilar spot like you.