Re: carrier grade nat?
Obvious answer: use IPv6. That is the only viable long-term solution. Your applications all need to support it, and sadly many audio games don't (which is terrible).
You can, as suggested, start up a VPS and forward traffic through it. Or you can connect to a VPN service that offers public IPv4 addresses to clients (there are a few of those). Or you can negotiate with the players on your game to join a social VPN that somebody has set up with something like SoftEther or OpenVPN.
But generally, unless you use IPv6, you can expect pain. I pity you, you poor creature.
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