I was about to rage at the sighting of yet another doomsday thread, but then I saw that I was mistaken.

Anywho, there are a lot of open world NMs to fight if you haven't killed them all already. If you can grab a few more 50s you could tackle the lv60 "HNM"s. Spend your faction credits on newly acquired Special Missions (Tarbh is a lot of fun to tank). Run Darkhold yet? The gear still looks sexy idgaf if Materia is better. There's also the new strongholds to explore with a party along with Ifrit (Hard) to face!

If none of that strikes your fancy you can always level up MRD to make your GLA better or level a DD job such as PUG LNC or ARC. Or change it up and level a mage (although mages are still kinda broken).