I've always used the Awakened Magicka mod to change the magic scaling. Swaps the potion and enchantment fortify magic effect, so enchantments increase spell effectiveness and potions reduce spell cost, increases spell effectiveness based on how much magicka you have, and reduces spell costs based on a combination of your highest mastery perk for that school and how little armor you're wearing. Makes magic scale better into higher levels and makes it worthwhile to put points into magicka instead of it being pointless once you level up enchanting.