While levelling make sure that you do the green and yellow quests first. If you don't pay attention to the level of the quests, you might run out of quests. I got stuck at lvl 29, because I had outleveled all the green quests and already completed all the orange and red quests. I basically had to search the continent for quests to make it to the next level, because the next batch of quests only became available at lvl 30.