Elsass' first prominent TV role was in Hulu's biggest show so far, "Little Fires Everywhere," which helped him ascend to the next level in his career. In the hit limited series, he played Trip Richardson, the older son of main character Elena Richardson (Reese Witherspoon) and her husband Bill (Joshua Jackson). Trip is a popular jock who develops a romantic relationship with Pearl Warren (Lexi Underwood), the daughter of mysterious new person in town Mia (Kerry Washington), who's in conflict with Trip's mother. Trip is a sensitive young man who's trapped by other people's expectations of who he should be, and Pearl is the first person he's ever known who sees him for exactly who he is.

For Elsass, landing the role of Trip meant that he may actually be able to have a career as an actor. "It was a validation of the work I had put in up to this point and showed me that I can have confidence that when the right roles come along, I have a real shot at them," he told Schön! Magazine. "My mom was not going to allow me to go to L.A. at all until I had finished at least my 2-year college degree, but L.A. came to me just a few months prior to meeting that goal when I booked this role" (though he did finish his degree online while filming the show).