Use a reverse proxy (caddy or nginx proxy manager) with a subdomain, like myservice.mydomain.com (maybe even configure a subdir too, so …domain.com/guessthis/). Don’t put anything on the main domain / root dir / the IP address.
If you’re still unsure setup Knockd to whitelist only IP addresses that touch certain one or two random ports first.
So security through obscurity :) But good luck for the bots to figure all that out.
VPN is of course the actually secure option, I’d vote for Tailscale.
And not only that but they will tag the domain with ”there is something here”, and maybe some day someone will take a closer look and see if you are all up-to-date or would there maybe be a way in. So better to just drop everything and maybe also ban the IP if they happen to try poke some commonly scanned things (like /wp-admin, /git, port 22 etc.) GoAccess is a pretty nice tool to show you what they are after.
Yeah that's a good point. The joke is mostly for my own enjoyment or any random user who happens to forget the jellyfin. subdomain.
I have had a few hits to /wp-admin, but cloudflare actually blocks those for me (I don't use a tunnel but I do use them for the domain name which helps a bit). I might just shut down the main page then.