Death is the Only Ending for the Villain

I've been reborn as Penelope, the adopted daughter and only noblewoman of the Ekart dukedom, the villainess in a reverse-harem game. The difficulty level is extremely high! No matter what I do, the ending is always death. Before the 'real noblewoman' appears, I have to somehow win over one of the heroine's love interests! There's my troublesome older brother(s), the crazy crown prince whose every route leads to death, the heroine-obsessed magician, and the loyal knight! 'Let's get rid of the hopeless ones first.' “I didn't know my place. From now on, I will live quietly without causing you any trouble.” But why does my likability keep increasing the more I draw a line?!