I think you might be overcomplicating this, because the Docker setup of Nextcloud is one of the easiest and most streamlined I've seen on Docker Hub. Including

I think you might be overcomplicating this, because the Docker setup of Nextcloud is one of the easiest and most streamlined I've seen on Docker Hub. Including the proxy, all you need to give it is the DNS name, the ports you want open, and where you want the data stored. Traefik is also huge overkill for a personal server, IMO. jwilder/nginx-proxy is braindead simple and has a companion container that will automatically get you LetsEncrypt certs when you make a new container that asks for it. The only thing the default Docker install is missing is a TURN server for group voice/video calls.