You left Hawkins because you’re adoptive parents (but they feel like you’re biological parents) had to move different places for a new job raise. And their boss finally gave them the okay to work from home. So they took this as an opportunity to move back to Hawkins. Btw you have powers like El, but they can be different from here and there. (You can choose how they can be different here and there).

Max: Guys, Guest’s coming back to Hawkins tomorrow!

Dustin: Seriously?

Robin: Who’s Guest?

Mike: You don’t know Guest?

Robin: Can’t say I do.

Will: Well, people say “run don’t walk away’.

Lucas: 'Cause she’s sweet but a psycho.

Steve: A little bit psycho.

Robin: I guess I’ll have to meet her tomorrow.

Eleven: She’s is like me, but her powers are a bit different from mine.

Robin nods taking a mental note on what Eleven said.