I’m not looking to become a sysadmin
And that’s fine and understandable. But I don’t think that Immich is for you. It’s not consumer-grade software. It’s a piece of Linux server software that requires occasional maintenance and administration. We haven’t seen a breaking update in a while but Immich does occasionally release updates where things will break if you don’t dig in to the config files and reconfigure it.
I just have a script that checks my IP every few minutes and changes the DNS record as necessary