Earth is puny. But... Our Sun might be useful.

There are unique things about our Sun. It's an energy dense mid-sequence star, in a galaxy mostly comprised of red giants. Also, it's in the center of a fairly empty region of space: https://www.google.com/amp/s/www.sciencealert.com/the-solar-system-floats-in-a-void-now-we-know-how-that-void-triggered-the-formation-of-stars/amp

If some aliens decided that our star is good for refueling or for settling a colony (or both) we'd be toast.

To achieve any fraction of the speed of light, you'll need a ton of energy. And, due to time-dilation, it's a one-way trip. If aliens decide to swing by us, it can only mean so many things...