What's the average level of your party? It can happen that the level is high enough that you won't get experience for killing monsters. This can happen especially if you have a short team (less than six). They gain levels faster, but eventually, outpace the enemies. After that, advancing is slower, and you have to make sure to do as many quests as you can find. You always get points for quests, no matter what your level.
Nightowl2
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