You could try, as I would do, is to have your bot update some code or text on a website, maybe like pastebin, and every minute, the server would check the API to see if that text exists. If it does, it would remove the player from game if that player is found.
Here are the pastebin docs. You can see how to send a paste request to a certain file. From there, you could do a “get” request on your game’s server with HttpService, parse the text your bot put on the pastebin, and then take actions in game.