Levequests and Duty Finder grind is my advice, if you haven't been doing the side-quests you may have lower level gear. The MSQ/Class Quests do up the difficulty fairly sharply (not, like, huge but I remember suddenly feeling under powered in the Coerthas Central Highlands.) You can also fate grind. MAKE SURE YOU'RE EATING FOOD. +3% xp boost may not sound like much, but it's a huge huge help. Also, you're hunting logs. If you're having trouble finding them, there's a hundred and one guides to finding them. I like ffiv.gamerescape.com because it's easy to access on my phone and gives a host of info for whatever it is I need.

(Also, doing the duty finder + fate grinding is an excellent way to also get seals for your Grand Company which leads to really lovely things like cool gear, fun barding for your Chocobo, and other nifty items.)