Just throwing some ideas out for Healers.

WHM: Become a proper weaver of damage and healing. Contribution to party progression with personal DPS.

Lv 72 Thin Air (Renamed to Lightstream): 1min CD
Acts as a sort of WHM Enochian. Lasts for 30s. Healing and damage potency increased by 5%. Lilly generation speed increased by 20%. Upgrades Stone IV to Glare and Aero III to Dia.

Lv 74 Trait Currents of Light: Each cast of Glare grants a stack of Currents of Light. When you reach three stacks your Fluid Aura is upgraded to Flood of Light.

Fluid Aura: 30s CD, oGCD 30yalms range. Deals 150 potency water aspected damage.

Flood of Light 30s CD, oGCD 30yalms range.
Deals 300 potency unaspected damage to target. Friendly targets in a 10yalm radius gain Lightdrizzle, healing them twice for 60 potency during 6 seconds. Flood of light resets the duration of Lightstream.

AST: Not changed much, just trying to adjust Sleeve Draw.

Sleeve Draw (Renamed to Celestial Alignement) 180s CD: Grants three different Seals, overwriting previous held ones, if any.
Grants "Revealed Divination" for 15s, improving the damage increased of your next Divination to 8% rather than 6%.

SCH: Give it a more elaborate Debuffing system.

Lv 72 Trait Upgraded Broil: Broil IV grants a stack of Dissolving Aether. Every five stacks your Ruin II spell is upgraded to Kaustra/Meltdown.

Kaustra/Meltdown: Deals 250 potency unaspected damage and inflicts target and targets around a 10yalm radius with Weakness Exposure for 15s.
Targets with Exposed weaknesses have a 1% higher chance to be hit with a critical strike.

Lvl 70 Libra: 1min CD, oGCD. During the next 10 seconds gain "Data Collection". Any critical hit on a target with Exposed Weakness will grant you a stack of "Battle Insight" , it can be stacked up to 10 times.

Chain Stratagem: Increases crit hit rate against target by 5% for 15s. Each stack of Battle Insight increases the effect by 1%.

I like the whm concept. Especially in the sense of it tying into the lore and helping to justify the shift from elements to holy.

Ast one is a mixed bag for me. the celestial alignment skill is a good concept, it's the effect of boosting Divination I'm not sure about. I can see that it only technically effects the opener and 6min mark reopened but still. I do see that it would massively increase the card draws that would be made minor Arcana as it effectively renders the seal system moot most of the time.

I have to think more about the sch one but from an initial glance I'm not digging the emphasis on buffing crit myself.

The whm ones are pretty good, though I maybe fluid aura being changed to water 1/2/3/4 etc would be better so it scales

Scholar ones are no slouch either, though I feel that the battle insight could be changed to direct hit rather than crit

no comment on Ast

The WhM one has a major flaw in that it adds one weave window every 2 and a half minutes, but 5-6 extra oGcd's that need weaving in that time. WhM desperately needs weave windows. Even the top WhM's in the world have to clip here and there. Clipping is not a class identity, it's clunky and broken design and no other class in the game has to put up with it.

So perhaps the best answer there is simply making them instant GcD's with 450 and 600 potency, which gives WhM bonus weave windows and movement tools.