I dont really want to edit my first post since thats supposed to be a summary of all the content I could think of in that very moment (I'm sure I missed some...), but I kept thinking about this a bit more and I feel you need to ask yourself the following question:

What do you want to achieve in this game?

Or, a bit less general speaking: What goal do you want to reach? What sort of content are you intrested in? Which aspects of the game would you like to see?
Specially the goal-part can be updated all the time!
I'll give you a personal example: Back when Snowcloak was released and I saw Fenrir for the first time I knew I wanted him as a mount! So, naturally, once he had been added to the GS for the cute price of 1 Million MGP (...why do you hate me so much, game?) I had a goal: Getting that mount! So I spend an aweful lot of time during the next weeks to farm MGP - back then that used to be even harder. Kept me busy quite a while - yep, I totally fell for that grind.

Basically: Look for a carrot thats intresting to you - and then work your way to it!
We're doing maps because we want the new glamour-gear.
I cant stand melee-jobs but I really want to see the jobquest-storylines, so I'm leveling dragoon and monk after all.
Crafting paid for my mansion. And I'm now cross-breeding stuff thats used for glamour, furniture and the chocobo in my garden.

Maybe you only enjoy the challenge of raids - then you can look at other challenging content in the game!
At the end of the day you need to answer this question yourself though: What do you want out of this game?
And then start looking if and where you can get it.