Good Day
Im here to talk about preventions of bots that are used in some MMOs that you could adapt to provide a smoother game to your players.
Do note that these are just layers of filters that helps their game to run smoothly, they still have a system that can fight against bots.
Remove/Lessen EXP in PvE maps - removing/lessening exp on PVE maps will make the exploiters hard for them to GRIND. Instead of making players grind on PvE maps, have them do repeatable/daily quest that gives exp cards sufficient enough to compensate on the loss of EXPs in mobs.
EXP Deminishing Returns - Bots/Players alike will receive a debuff if you take too long on grinding in one area/spot. EXP gain will diminish the longer you stay in one map/channel.
Buff EXP in dungeons - to compensate for the exp loss in PvE maps
Cutting their path to gain exp is one of the best filter to prevent bots.
Reporting will do you/us no good if the bot keeps on spawning especially when F2P goes up. It will only tire your staff and players who manually reports it on a daily basis.