CloudFlare offers the ability for you to turn on CDN caching and present your service to the public without requiring a public IPv4 address (so long as you have a publicly accessible v6 address) To turn it on, add the DNS entry to your domain on CloudFlare, and then turn on the caching service (Coloured in logo)
The caveats with the CDN are the same as if you had a v4 address; only certain ports (eg. 80, 8080, 443 , 8443, etc.) work. The output from your server is cached/proxied via CloudFlare’s CDN servers. So it’s not a full fix; eg. no port 22 to ssh in, but for running a web/http based service can be quite useful.