I read the story Mysterious Mare Do Well Alternate Ending: Rainbow Dash Leaves and it made me sad that Rainbow just left everything behind, especially Scootaloo

That is why I would like someone to make a sequel of the story where Rainbow comes back, and even have her and Scootaloo start a sister relationship, If it's too much trouble. If you do, I would really appreciate it.

Oh, God, guy... I will give advice - leave it and don't worry. So too happens. For example, I don't like "Scootasuicide", but I'm not asking someone to write that she was resurrected.
Just imagine that she's back and all is well.

5864078 Honestly, if I didn't have a workload of my own, I'd write a sequel. The story just didn't feel... complete, for reasons besides the sad ending. Plot threads left hanging, and all that.

5865225 so if your finished with your workload, you would write It?

5865661 Might do, but my workload won't be complete for a while yet.

5865715 If you do, put it in a file for future projects (which you may or may not have) so you don't forget.