How to level up at 980+?

I can only level up my power by doing the Garden of Salvation raid and Pit of Heresy dungeon? because of the triumph required for the Undying Title I have to do The Ordeal with 980 power and I still on 967. I got one week left and I don't think a can do it in time and get the Seal.

[EDIT: Yes, it worked guys. Needed some patience and time but it worked. I got the triumph now. Thank you so much for your comments!]