Stranger Things very famously had that one episode in season 2 where Eleven travels and joins another group of teenagers with superpowers - it was an extremely unsubtle attempt at greenlighting a spinoff that never happened.
After that episode this was never mentioned or brought up ever again.

I mean the series did peak in season 1, but season 2 is the worst one by far. If you do pick it up again you'll probably have a better time once you get through the bad parts.