What’s your issue exactly?

Personally, I set up Caddy with subdomains like radarr.local.example.tld, added a DNS entry on my domain so that *.local.example.tld points to the local IP of Caddy, then followed this guide so that Caddy issues TLS certificates using the DNS challenge (since the subdomains don’t point to anything accessible from Internet) along with the caddy-docker-proxy plug-in to easily manage upstreams.

Don’t you have any off-site backup? It would help keeping some peace of mind knowing you have a copy somewhere else.