What power source could accelerate my O'Neill cylinder to fractions of c?

An O'Neill cylinder for those not in the know is basically a space habitat consisting of a rotating cylinder 32km long and 8km in diameter. I want to turn one into an actual spacecraft rather than a habitat. Assuming the ones building/retrofitting this enormous spaceship are god-like posthumans, what are some potentially theoretical energy sources I could use to explain how they get something this massive moving so quickly in a relatively short period of time?

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What power source could accelerate my O'Neill cylinder to fractions of c?

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