I am having the same difficulty. Here is what I have been doing:
  • Travel to the other City-states and look for quests (minor XP via exploration)
  • Levemetes and Guildmetes (good XP, some gil)
  • Kill above-level monsters (modest XP)
  • Hunting Log (good XP)
  • Dungeons (good XP, iffy gear drops, poor gil)
  • FATEs (good XP, some gil)

When I get tired of grinding as DoW/DoM I become a DoL and grind that for awhile. When I get tired of gathering materials I switch over to DoH and grind there for a while.

Notice a common theme? lol Grinding is the name of the game....