95% of the world is not even being used.
All they need to do is update the mobs levels in the world and also in the dungeons like Cruma, Forge Of Gods and Antharis Lair.
Make Raids back to how they use to be with good rewards. Bring back catacombs with updated mob levels.
It does not take much to fix this game. They dont really need to create anything new. Just update what is already there.