Main Storyline Quest, Where does it start?

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.

Basically the Main Story Quest line starts in the Adventurer's Guild of every city, so you should go there and talk with Mother Miounne.

Every Main Story Quest is marked by a Meteor shaped admiration icon, so they are pretty easy to spot on.

Hope that helps.

My first main quest was saving a little girl from a monster and its minions.