Please make an online Reset. You know your playerbase is plummet to 20k now, 70% of them dont spend a single dollar for your game because they mess up their build and lazy to reroll. So why don’t you make an event, a 1 time event to make them reroll their class to rank 6 for a character over lv 170 created before June 2016.
How to do it? Forumer asked. Here is a thing
I know you have this kind of item in your source:
So an online event is doable. Event participant need to do this: Make a new character. Summit online your old character with precondition cite above. These item will be transfer to your mail box and only the new character can redeem it.
It is a 1 time event, so it is not a gamebreaking item that make everyone play a faceroll character to level and reroll to the hard to level character every elitist QQing about.
May be this event could resurrect the dead population who quit playing because they mess up with the non meta build.
Or you (IMC) just leaves everything to be the same dead as usual, and focus on your Korean playerbase. It is a good strategy anyway.