Not likely that it can be saved. You can't really put stems back together. If the seedling were farther along you could just cut it where it broke and hope that it would regenerate from the roots. But this one is such a baby. I think (unfortunately
) it is start over time.
But might I suggest that the reason it broke is that even before the accident it was looking very leggy... weak and spindly and stretched out. It looks like it wasn't getting enough light. With not enough light, plants tend to get tall and spindly, stretching themselves up to try to find some. Healthy seedlings would be sturdier looking. If you are going to start over, try adding some artificial lighting (or if it was under a light try bringing it down closer--for starting seedlings the lights should be just a few inches above the plant and on for 16 hrs a day).
Better luck next time! And welcome to our forum; hope you find it friendly and helpful.