Improving latency with a VPN can be tricky because it really depends on routing and server locations. I've had decent results testing different providers when gaming with friends in Europe. On my iPhone, I tried the FastVPN app (apps.apple.com/us/app/fastvpn-secure-private/id1381516895) for a few weeks, and connecting through a server closer to the game server actually gave me more stable ping during evening sessions. It won't work for every game, but it's definitely worth testing a few server locations before settling on one provider.