i would make the game p2p at least 5-10$, and reducing the TP cost of item mall
putting some staff or a willing player with some TP reward to bot hotspot (solitary cell, etc)
or, idk maybe code something to make a boss apprear and targeting the bots only, if theres suspicious bot movement stuff and then disappear again
IP ban? maybe not that effective since you can change ip easily
perma ban for bot user
or theres this command from csgo custom server ive played, where you can call an admin using server command for behaviour that against the rule
theres definitely 0 way to kill all the bots but i believe at least making the game to p2p will reduce the bot count
and if im being fully honest, a few bots i fine, but if theres shitload of bots it would kill the game, i mean for e.g some material are too damn hard to farm, lets say something like red dawn (phada), it would take days or week, and a few bots may help the process since you can farm pure silver easier (sausys9, etc) than farming those 0.x-1.x% material with low spawn count and wide area of spawn and buy it from market with reasonable price