My suggestion is to add NPCs throughout the game that give players access to 5-10 part mini quests. Have them instanced like personal story is, but not as long. These Mini quests would take a few days of casual play solo or with a group (and having selectable difficulty would be fun)
At the end of each quest there could also be a unique boss fight to wrap things up and really put the cherry on top. And stories could include wars towns, Defending a town from giants or something, Ancient Dark powers arising from a anciently dark temple, A quest to kill a dragon hatchling before it grows to large to handle, A quest to rescue a damsel. Just quests that make you feel epic about the experience.
I just think it would be nice to get a little more role-playing in the game to counteract the farming side of the game. I would even purchase an access token to epic mini stories for 100 gems or something (hint hint could potentially make money)
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