I'm a Thamaturgie, and I do have active the L15 quest for that guild and "Oh Captain", from the main questline. But I can't do any of them as I need to gain a few more levels first.

My problem is that I can't find any more quests to do. There might be some low-level quests back in the city, but I doubt they would be worth doing exp-wise now.

Where can I go to find L15-quests to do? Are there any quest hubs around that lvl for me?