Don’t confuse “on stage” to mean only a physical stage in front of a large audience. “On stage” can include a job interview, talking to your kid, training some coworkers, or even taking on a leadership role.
No matter what “on stage” means for you, both the question and the correct answer are the same. If you are there for yourself, you’re doomed from the start.
No matter what the role, your first question should be, “how can I best serve my audience?”
Start there and you’ll never be received as a selfish speaker.