In that case (which I believe is not true for almost any modern human, so this is a purely theoretical answer), it's logical to conclude that it'd be good for you to cease to exist. In order to prefer that others so cease (assuming you're a utilitiarian), you'd need to believe that every individual has a similar weighting.
If I ceased to exist there would still be people that suffered without a choice. Ceasing to exist wouldn't change this while if everything ceased to exist, it'd change.
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