I’m still a bit confused with all of this so I might be getting things completely wrong. I thought that I needed to get certificates for anything that I wanted to make public with an URL, and that’s where I thought Caddy came in, but a few of the other replies have said that I can use the Cloudflare tunnel and let them sort out the encryption. That seems like it should be easier for me, as I’ve dealt with it already.

IPv6 isn’t available through my ISP as far as I can tell, they only enable it locally through their router at the moment.