Instead of making land only go up to 100 in level, why don't we have a prestige system?
Once you reach level 100 you will be able to prestige your land(Basically start over) but you will get a little icon that tells other players you've prestiged that land.
Maybe add a cool icon to the white screen once you click on land.
There should be at least 20 prestige. Maybe within every prestige, there can be a certain benefit.
Once the player prestige he/she can get a special item.