quick observations;
get a purple gem in your helm for more health
chest and legs should have yellow gems for the intelligence boost
get doing some greater rifts for the gems, you will want something like bane of the trapped / bane of the powerful and esoteric alteration is a good survival boost - put these gems in rings and necklace
you want a travellers pledge and compass rose combo (necklace and ring) for the massive damage boost and defence boost when moving
in terms of rings, try and get a short mans finger and use the cold gargantuan rune
get a green gem on your weapon for the damage boost
gloves - reroll reduce resource cost to crit damage
upgrade in the cube or gamble shards with kadala to get better legs, chest and shoulders, also belt as that is for a strength class