it would be so easy.. just less exp in fates (so the real reason for fates would be the seals, not strict lvling to 50)
more exp from trash mobs..
the exp from dungeons are good enough, i hate to re-do the same dungeon over and over when its just for lvling (i just ignore the most fates because of too fast lvling, resulting in not learning my class)
the most exp should be given by levequests, but there should be a timer on rejoining a levequest. and they should be a bit longer than just "kill 5x .."
like, when you agree