Actors turn down roles in movies and television series all the time. Sometimes scheduling issues are to blame while sometimes an actor just doesn't want to commit to a project. When an actor declines a role, they don't always anticipate it will be a huge hit. So when a production turns into a monumental success or propels an actor's career, those who declined are left regretting it big time.
https://www.trend-chaser.com/entertainment/these-actors-passed-on-iconic-roles-and-regret-it/