This could be hard to implement, but maybe player could trade 2 same spells to 1 of a random different element. Or maybe it could just re-roll if new spell has same element as previous one
Viewing post in Monster Quest Jam jam comments
May I suggest a shop mechanic, where you can spend points to purchase boons, such as a reroll, or maybe a specific attack type, etc.
Then you also have to consider your current points that you have to spend (thus temporarily decreasing your score) in order to potentially earn more points in the future.