best place is bosses in act 1: Nessus, Polyphemus, Arachne, Gorgons, Alastor, Minotaur, 1st Telkine.
Other advice is kill a lotta crap. It'll drop and you will feel happy when it does
If your too high level to gain xp in act 1 it might be time to build a new char (who doesnt use achilles relic) and trade using caravan or mod (TQ Vault)