Your part in this tale is over.
Don't be bitter, when someone new
Takes the stage as you're exiting.

The sun isn't bitter at the moon.
In fact the moon is the sun's biggest fan because her mediocrity pays reverence to the sun's light.

Mediocrity; petty behavior, casting a shadow on someone else's journey while hiding in the shadows.

Know when it's your final curtain call.

Don't linger.