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.

Same I was really surprised how easy it was. Thank you Lutris