If possible, how would I edit a field

The game I'm trying to hack has alot of set limits that frankly just stop me from enjoying the game I found a function that tells the game if i have more than the limit as a bool (which i set to always return false) The problem here is that the game prepared for more than 7 and when you have more than 7 then it starts bugging out I suspect that changing the MAX_NUM_CHARACTERS field would fix all of my issues but I cant find anyway how to