I think Elite Dangerous had this same issue, at least the years after it was released when I played it. You have this whole to-scale galaxy to explore, but the vast majority of them contain no story, no life, no space stations, no other players, and are just similar rocks and noble gas bags over and over. Once you've seen about 100 systems, you've seen them all. Which is likely what our real galaxy is like, too.

The game is 2 million light years wide, but a meter deep.