The server now automatically shuts down servers with no players after 5 minutes (via checking if any players are connected to the proxy, not by querying the backend server) and starts them on players trying to join. Viaversion has been uninstalled from velocity (the proxy), as it was giving protocol errors intermittently for newly started servers. I now only have viaversion in front of the limbo server, which was not having issues, with the addition of viabackwards to allow old versions. Installing that to the limbo server was required as all minecraft versions connect to it, and limbo only implements support for one nativly.