A possible solution to tackling the bots,
When a user logs into the game through the steam client you have passed the steam verification that you are the account holder and after that, the user is free to do whatever they want, so this solution would be a minor inconvenience for the players but could be a better solution.
Implement a Lost Ark Authenticator in two parts, the first part uses the authentication code from an authentication app the second part in which you send a text message to the users’ phone both have to be entered to unlock the game.
Edit since we can only go so far with verification like KR you have to verify who you are through your social security identification. other possible solutions have to be considered.