Death Is The Only Ending For The Villain

I reincarnated as the villainess of a reverse harem game—the step-daughter of the Eckart duke family. But the difficulty is maxed out! Everything I do leads to death. I must pair with one of the heroine’s male leads before the ‘real daughter’ appears: two hostile brothers, a crown prince whose route always kills me, a wizard blind to all but the heroine, and her loyal slave knight. ‘First, let’s cut my losses!’ I decide to live quietly—but why does their interest spike every time I back off?