If you aren't behind NAT and know how to handle your own networking you can get free IPs from HE.net. That's the easiest way.

I use ipv6rs because in my case it's cheaper than using a vps since there aren't any bandwidth caps and I only use 3 IPs (jellyfin and *arr).

i use their cloud seeder which has an ipv4 reverse proxy https://ipv6.rs/proxy

I tried with HE and you need an external IP before you can use it which makes it completely pointless. I think it's way easier to do it with ipv6rs.