You need to call your isp and request a static ip. Most probably they’ll say its extra but usually around $5. If they say they don’t give static ips to individuals you can request an ipv4 dynamic address and use a ddns. ipv6 only networks also result similarly to double nat
lol, except the high prices in your country provide welfare and health benefits to everyone, a safety net for less privileged. High prices in US allow billionaires to buy their 4th yacht