In many Marvel stories, and now increasingly in the MCU, many gods and other figures from ancient human mythologies appear as extraterrestrials or creatures from other dimensions.
Out-of-universe, the mythologies of the various cultures of the world offered rich sources of inspirations to the creators of the various series and storylines.
But is there an in-universe reason why so many powerful beings converged on Earth of all planets, and got involved with humans in one way or another, especially with some many larger and more evolved civilizations in the Galaxy that they could have had more interesting dealings with?