All arcade and mission activity is down, even during peak hours. The type of player that would be attracted to this kind of game is most likely too old to bother. Isometric games are dead, so you need to appeal to someone that isn't filled to the brim with nostalgia. You need the maplestory audience, and I need to actually play with someone during peak hours.
We're in a bind here, what should we expect from you?
you mean...
re-do completely the game with another engine, or another point of view, or simply adding new mechanics that will destroy current gameplay?
you had better make another game entierly.