I am lvl 48, I did all quests in town (Gridania) and now my quest log is empty and I see no more new quests....

I am at a loss as to how to continue.

I don't have access to the Duty finder, I asked around and people said that it's because I need to do more main storyline quests, but I don't know where to start it!

HELP! I am stuck in Gridania!


PS.
I already did all my Lancer quests and my Dragoon quests.