It was a boring task to farm monsters in order to level up, especially killing of over-level monsters. One needed to stay on their guard constantly, coordinate their muscles flexibly and robotically repeat their actions for long periods. That was a challenge to the players' willpower.
As opposed to farming monsters and leveling up, the fun and interesting parts of the game would only be exposed to the players when they changed jobs. There would be a variety of missions, all sorts of dungeons, multiple hidden maps, and monsters which players could choose to play with. Those would definitely invoke the interest of players more.
One could help to make some deliveries, have the chance to try their hands on a few monsters from missions, explore a mysterious map, etc., then. If one was lucky enough, they might meet some cute and single girls while completing their missions, and they could arrange to meet in real life to enjoy meals over hotpot, etc.