At the hubs like EGLL and KLAX or KSFO training server is pretty much anarchy.
One way to go about ATC controlling is starting an ATC tracking thread on the forum for your username, and announce that you’ll be operating a particular airport’s ATC (preferably far away from the hubs!) at a certain time, and ask people to join. It’ll save you the hassle of trying to deal with trolls on TS. Oh and you’ll also gain experience that way, if you ever plan to apply to become an IFATC controller!
You can find more info on that here: