My request would be for saves across the board to be a bit more consistent and balanced among the races.
100 saves on a fire giant feels like you shouldn't have bothered because everything still lands.
100 saves on an elf feels really impactful and worthwhile.
Additionally, character level difference is way too important in spell resists.
I'd love to see spell resistances reworked to be a bit more standardized. Bring up the bottom, drop the high end, and maybe cap the level difference a spell can be to 9 or something rather than 18.
I'd really just like low int and wisdom to not feel like spell bait.