You are a great tentacled cosmic deity, drifting through the endless void. Space can be very boring at times. But every now and then you find something that can hold your attention for a few hours at least. This time, you found Earth.
Raise and feed Humans.
Build all the necessary items to make the Humans feel at home. Make sure they are fed and put to work. As you learn more about the Humans, you can learn to better accomodate them.
Process Human byproducts.
Human waste can be deconstructed into pure matter and used for building. Many parts can be used for cloning, allowing for potentially infinite expansion. Watch as they churn their own milk for you to sell.
Butcher the Humans
Take their skin, their flesh, their brains. Build ever more elaborate and beautiful factory lines. Remember, Human meat tastes best when cut from a living soul!
Trade with the other cosmic space deities. Analyze and gain new technologies. Become the greatest great one in the multiverse.