Satellites fly unpowered and frictionless in the vacuum, with kinetic energy equivalent to speed of Mach 22 at sea level, balancing against Earth’s gravitational pull, along an own 2D ellipse with one focus at the center of the gravity of the Earth.

So you can’t like fly a 3D orbit, fly at same altitude but different angular velocity, or change course without expelling significant amounts of mass. You play by those rules.