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.

It`s good to always be sceptic, however I have been using and following Signal for years and so far they have not given me a reason to misstrust them. You should read their answers when some judge with 0 digital competence tries to subpoena some chat protocol.

Can you elaborate?