-Give back the individual fairy toolkit Eos and Selene had (with a bit of rework for selene) with limited ways to switch between them in battle at no dps loss so both are relevant and knowing which to use and when becomes important for the class

-Give back old dots with different timers and some skill with dot interactions (i.e a Shadowflare/Fester that deals extra damage per tick if the enemies are afflicted by Sch dots) so there is more depth in the dps rotation to compensate for...

-Rework Aetherflow so the healing actions are not dps negative and become neutral/positive, this would need a rework of ED too but seeing how this game is moving away from dps loss cooldowns is probably the logical next step

-Additional uses of the fairy gauge so it becomes a more integral part of the job instead of a gauge for just 1 action

-Expand Deployment Tactics so it spreads both dots and Chain stratagem like pvp

-Reevaluate what the job really needs and what is basically there for the sake of being there, skills like dissipation, physick or protraction are stuff that could go easily to the chopping block for being either redundant or simply going against the job playstyle

I said it in a rework post I did some time ago (even if I currently don't agree with all the changes there), they can do a lot with Sch they just need to care.