Instead of long and tedious dungeons, that requires a lot a time for the casual player... How about some dungeons similar to the Shuyal Dungeon. However, small mobs will spawn in short waves, instead of the boss itself spawning immediately.

Since the game's majority of players are casual players, the time spent conquering the dungeons should not be somewhat strenuous. These dungeons should not take a chunk of time to complete, but will still require effort to complete.

Just my opinion ofc.