When you step into a higher tier zone, the loot drops will always be better than the previous tier. You should go to Thundering Steppes - lots of solo mobs there within your level range.
Make sure you have poison activated.
Use a ranged skill that deals high damage or a debuff like Wounding Arrow.
Use another bow skill if you have time.
Switch to melee weapons.
Use debuffs to weaken the enemy.
Stun the mob with Cheap Shot, then move behind it to use rear/flanking skills.
Melee normally, using HO's for extra damage.
Once Cheap Shot has refreshed, repeat until mob is dead.