Solution:

Use a VPS somewhere that will act as a proxy to your home server.

Connect the VPS to your home with wireguard/tailscale and do reverse proxy to your game server.

Now the public IP will be your VPS. Host it in an other close by country.

Of the IP does get flagged, change the VPS provider and keep the exact same setup.

Use GPT /r/selfhosted or GPT for a step by step guide