Divination type spells are interesting. Perhaps use the quest log as the basis so if you have a quest to find X and cast a spell X will appear on your map. Or the quest is to fight Y, maybe you learn about their vulnerabilities.
I'm curious how they implement Monk.
The illusion spells are difficult. They could give the player a limited number of illusions to generate. And look at how illusions are used in table top. So an option for disguising, distracting, scaring etc.
I would like to see a wizard class that specialises in crafting (take ideas from artificer/ wiz subclasses etc).
I'm also happy for them to just remove spells if it can't be made to work well in a vid game.