True immortality is not about remaining in your physical state indefinitely.
True and realistic immortality is to continue living, through other means, beyond the physical state.
True immortality is achieved through aspiring to greatness.
Greatness is achieved through leaving the biggest possible imprint. In a positive manner of course.
Become so undeniably great, that it would be ludicrous for others to disregard the imprint you have left. Through this, you will live forever in the hearts and minds of people