Actors must be wired . Acting is reacting. Idea of who your character is, not just using yourself. Actors must be inventive. The more inventive you are, the better actor you are.
Actors have to attack the work.
Stop acting, get involved emotionally, can't act with brain, must be feeling. Watch the best actors and steal from them. Turn on your lights , not grim, but excited. You must reveal everything about the character. You can't be intense, must stay relaxed.