The first thing that jumps out at me is your item rerolls, namely: they are terrible. Your weapon doesn't have a socket, which is a HUGE DPS loss. You want to roll Vitality off for a socket and put a +130% crit damage gem in there. You already fucked your gloves for thorns damage for some reason, gloves should have: mainstat, Crit chance, crit damage, whatever. You want crit chance on your helmet. amulets and rings should be devoted to damage stats as much as possible while having sockets, there can be a lot of RNG involved there, but especially on amulet, 100% CD and 10% CC is huge. The exception to this is that some legendary or set effects from jewelry are so desirable that they supercede whatever DPS gain you might get from other stats, so you might keep, say, a poorly rolled Compass Rose. Generally you don't want movement speed on boots, you want to get 25% movement speed from paragon. You're also gemming for Vitality, which you should never do. Gems should be All resistance or mainstat, except possibly in the helmet, but usually you want cooldown reduction in the helmet.
Since you have full Firebirds, I recommend following this guide, at the least it will give you a better idea of what goals to shoot for, how to prioritize rerolls, etc.
http://www.icy-veins.com/d3/wizard-firebird-archon-build-patch-2-4-3-season-9