wireguard

BitTorrent and private-tracker clients benefit from accepting inbound connections, but CGNAT prevents that. Your ISP places multiple subscribers behind one public IPv4 address, so there is no inbound mapping for the home server. Port forwarding on the home router does not help because the relevant NAT is upstream at the ISP.

A VPS with a public address and a WireGuard tunnel can relay the traffic. It receives torrent connections on a port range and forwards them through the tunnel to the home server. To peers, the home server is then reachable at the VPS's public address.