Also don't forget your weekly Wonderous Tales - getting that done each week will get you about 1/2 level's worth of XP for free (plus if you complete it by running the content synced you'll get the XP from that too).

I personally used a mixture of Roulettes (especially PvP as you can swap jobs when you've entered but still get XP on the job you queued with, and it's quite a good amount even if you lose), running highest dungeon with Trusts (usually 2-3 runs will get you a level), Wonderous Tales (if you have second chance points you can easily complete this by re-running a low level extreme un-synced several times for like 20 minutes) and beast tribes (pixies).