Ok, so, sounds like you're not familiar with Cloudflare.

And, it doesn't sound like you're currently running a website for your domain, is that correct?

Cloudflare protects websites from DDoS attacks, cache's your website content, handles https certificates etc.

And, it can make it very easy to serv up a NIP-05 address for your domain, even if you don't have a website. It's free, won't cost you anything.

If you're interested, create a free Cloudflare account. Follow the instructions to setup your domain on Cloudflare and then you can use the Cloudflare website to setup the https certificates and redirect for your NIP-05.

Cloudflare is a content delivery network. A CDN. cloudflare.com