Ive recently came back from a 6 month break so I've got loads to catch up on.
I've got the same approach as jeeqbit. I focus on mount collecting. So right now I'm splitting between A/S hunts, fate farming, lvling (mostly via fates and society quests), getting points in cosmic exploration and Gil making.
I had given all of my Gil away when I stopped playing since I thought I wouldn't come back. So for Gil, treasure maps are always a good time, solo or grouped.
I need to get my butt back into doing extremes and maybe savage but I always suck with harder grouped content.