You had saved The Multiverse... but even being a hero can only go so far.
You had to return to your foster home. Faced with the reality that all your new friends, new family, heck even your father (Who was Optimus Prime himself which,,, explained a lot really,)... you'd never see any of them again.
Months after, the news was talking about all the people from The Multiverse coming back to Earth-Alpha, with everyone interacting again. It made you happy, but unfortunately you couldn't be part of it. You had stopped hiding your cybetronian parts by this point. Your foster guardian had arranged for you to be adopted by a new family. You hated it. But you couldn't do anything.
That was until one day, there was a knock on the door and your guardian came to the door. You weren't paying attention to the conversation.. That was until you heard a familiar voice.
"Oh, well that's too bad. For that family."
Lumi. Former leader of the white faction. Your caretaker... and older sister figure.