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It’s simple. We’re the first intelligent life in the galaxy. There is nobody else yet in our galaxy.
Also, probably nobody capable of traveling the stars wants to settle a planet. Once you figure out how to make huge spaceships (which you’ll need to travel interstellar space) you’ve essentially learned how to make cities in space. Our solar system would support a lot of people if we just used the resources available for space habitats, and by “lot” I mean in the quadrillions. And it turns out that all you need to support that population is a star to provide energy, and some planets to source materials from.
So with that in mind, why bother finding another habitable planet?
Xenoanthroplology. We’re obviously not crazy and our many cultures are presumably much different from theirs. There would be enormous amounts to learn from studying our differences and our similarities.
Unless they’ve already simulated alien life in computer models… Then there’s not a lot left to learn.