[@tealrootssss]

The abilities needs to be balances with a corresponding weakness. Being able to alter someone's mind at the drop of a hat with no backlash is very OP(overpowered). 

Not anyone will allow a random person to invade their mind. You have to have a reasonable excuse or way to be able to alter their mind. What criteria does your character have to make? What drawbacks are there from altering someone's mind? In what ways does your character plan to use this ability?

Maybe this will help a little? You can refer to my CS if you need pointers!