Mail Pony: If you say so. I’ve got another letter for you. From Sire’s Hollow.
Sunburst: Mm-hmm. Sure thing.

Or just write letters to Sunburst to keep in touch.

Because we know Sunburst always reads and responds to letters from the ponies who care about him.

@Digital Seapony
Especially when the return address is Sire’s Hollow.

“There are many parts of my youth that I’m not proud of… there were loose threads… untidy parts of me that I would like to remove. But when I pulled on one of those threads… it unraveled the tapestry of my life.”

• Jean-Luc Picard, “Tapestry”

1. Multiverse Theory, in which Little Starlight does change for the better and the events of the main timeline don’t happen in Little Starlight’s world, but Big Starlight’s world is the same.  
2. Bootstrap Paradox theory, where Big Starlight’s message to Little Starlight makes Little Starlight turn her life around and thus make Big Starlight not exist in this form, so Big Starlight never comes back to tell Little Starlight to stop her shenanigans, thus Little Starlight does NOT turn her life around, thus Big Starlight DOES come back to tell Little Starlight to turn her life around, repeat ad nauseaum.  
3. One Timeline theory, where Little Starlight doesn’t listen to Big Starlight and the timeline’s events still happen.  
4. Looper-style theory, where Big Starlight spontaneously stops existing once Little Starlight receives her message. RIP. Yes, this would cause the same issue as the Bootstrap Paradox, but since the movie Looper ignored that, so will we.  
5. Single-loop theory, where Big Starlight goes back to her world to find that her life is radically different, without any of the memories she’s supposed to have. Oh no.
    
   The moral of the story is, don’t mess with time travel, kids

“Who the buck are you?”