Perhaps they can add a class challenge log for each job? With each role having specific goals to achieve. For example a tank needs to minimize a certain amount of damage with his cool downs or beat some specific trial or dungeons. Perhaps a healer needs to heal a specific amount of lives over the course of 1 week. DPS have to deal a certain amount of damage in dungeons. Maybe they can even add a speed run challenge log. Beat a dungeon synced under a specific time or beat a dungeon with no one in the party dying once.

SE needs to add more fun challenges for the challenge log.