looking for build advice on a caster invoker

Hi all. I'm a fairly new player. I didn't play much of poe 1 cause I was addicted to dota 2 so I could use some build advice. My build is a caster monk with a focus on cold. Here is my skill tree plan

https://maxroll.gg/poe2/passive-tree/6c3t50fu

Gems I'm using are

Herald of Ice - Biting Frost / Elemental Focus

Glacial Cascade - Martial Tempo / Primal Armament / Cold Infusion

Frost Wall - Spell Cascade / Icicle / Concentrated Effect

Wave of Frost - Deep Freeze / Magnified Effect / Glaciation

Hand of Chayula - Freezing Mark / Hypothermia / Heightened Curse

Cast on Freeze - Comet / Impetus / Spell Echo

Elemental Invocation - Comet / Capacitor / Inevitable Critical

Ghost Dance - Clarity / Vitality / Cannibalism

Unbound Avatar - Cold Mastery / Fire Mastery / Lightning Mastery

Things are going pretty well I'm just wondering if I could optimize this further. Like I wonder if I really need ghost dance and could fit in another offensive spell and which one would that be? Also are my support gems the best they could be? Finally I feel like my passive tree choices are decent but I could be wrong on that lol. Thanks for the help.