Melin's Salvation Plan

i suddenly woke up in the body of melinia, a supporting character and the first love of male lead a from “azuli's magnificent misfortune.” since i know how this tragic tale ends, i decided to do what i can to stop the ultimate destruction of the kingdom from the male leads. but the more i try to fix things, i can't help but notice that the storyline seems to veer farther away from what i read. will this plan of mine work? or will it just cause more harm than the original?