Well its basically this. Once you hit 600-800 you really have nothing to do but grind. But you could make items such as monuments for each race that raise exp gain, small boosts, etc..
What would happen is each race would have a monument. Other races could steal these monuments to decrease exp gain for the race they stole them from. While the race was incontrol of another races monument they gained a x1.5 exp boost. Lvls 250 and below would not be affected by the exp gain or decrease.
Why:
This would allow higher levels something to do other then just grind for higher levels and wait for events,
What would happen is each race would have a monument. Other races could steal these monuments to decrease exp gain for the race they stole them from. While the race was incontrol of another races monument they gained a x1.5 exp boost. Lvls 250 and below would not be affected by the exp gain or decrease.
Why:
This would allow higher levels something to do other then just grind for higher levels and wait for events,