Since the public servers suck, I host my own server
Server IP: 51.15.47.175
Download the client and run it before starting the game
https://github.com/Impostor/Impostor/releases/download/v1.1.0/Impostor-Client-win-x64.zip
Only on Android 10 or less
Make sure you run the game first once
https://github.com/NaokiStark/Crewmate-switcher/releases/download/1.2/Crewmate.apk
Sorry, needs jailbreak
Manual file replacement required, get file via https://impostor.github.io/Impostor/
Default path is
~/.steam/steam/steamapps/compatdata/945360/pfx/drive_c/users/steamuser/AppData/LocalLow/Innersloth/Among Us/regionInfo.dat