Television

Sophie Turner has had a decent run of mid-tier high budget movies (the jennifer lawrence xmen movies) and I think is the new live action Lara Croft?

Robb Stark was in that show about the bodyguard who banged the president while calling her "mum" the entire time? I hear that was good? And he has pivoted that into even more pseudo-spy dramas?

Kit was one of the less offensive things about Marvel's Eternals. Allegedly. Nobody watched it.

But I think it is also important to remember how a lot of these major franchises go. Most of the cast are hired REAL young because they are basically signing a contract to be in something for a decade or more. The known greats are wary of that and are going to want a lot more money and may just bail. See Elizabeth Olsen in the MCU where she clearly decided she was done with that shit. And that is why it tends to be less "Wow, so and so was a great actor" and more "So... both the leads of Twilight kind of just became known for really quirky low budget films they took because they are already set for life monetarily?"

Sometimes you get lucky? Most of the time you don't. And you rely on your supporting cast to carry the production. And most of the GoT supporting cast were already known amazing talent with established careers who just continued doing their own thang after the fact.