Quickest way so far for me has been to boost in an instance till yeh burn of rested state then run quests.

At 65 look into nagrand the ring of blood which gets a nice chunk of exp and some random blue items
Do that one first with the help of yer 80 then do the mastery what ever its called quest line there's 3 of em nice kill quests and
There quite a few other kill quest here that are nice.