Rachel Platten returns to her roots with Boston show

Rachel Platten returns to her roots with Boston show

Imagine looking out at an audience and seeing banners that read “You saved my life.” This became a common thing for the Newton-born songwriter Rachel Platten after the platinum success of her 2015 anthem, “Fight Song.” “It was hard for awhile to remain grounded,” she said this week. “You start thinking you’re something really special, and that can ruin your art as well as your relationships. After a lot of therapy I was able to say, ‘Hey, wait a…