To be moral is to actualize your potential
I originally took this to be the "meaning of life" but now recognize that is really just a moral obligation. I don't think there is any objective meaning to life as I somewhat suggest here
The extent to which you succeeded in this life MORALLY is the extent to which you actualized your potential to influence the world in the way you believe is good. It is always right now so this is the only moment you have to realize that potential.
I get to determine the impact and meaning of my life -- the way in which I should actualize my potential -- because I am being asked what life means.
You have a tiny amount of control over the arc of humanity, but you are lucky enough to have some. No matter how little power or influence you have, you have responsibility over your tiny web of influence (for me, to change others lives for the better). Each challenge you face is figuring out how to best take care of this responsibility and do what is right.
“Instead of possibilities, I have realities in my past, not only the reality of work done and of love loved, but of sufferings bravely suffered. These sufferings are even the things of which I am most proud, though these are things which cannot inspire envy.”
A man who becomes conscious of the responsibility he bears toward a human being who affectionately waits for him, or to an unfinished work, will never be able to throw away his life.
"By his love he is enabled to see the essential traits and features in the beloved person; and even more, he sees that which is potential in him, which is not yet actualized but yet ought to be actualized. Furthermore, by his love, the loving person enables the beloved person to actualize these potentialities. By making him aware of what he can be and of what he should become, he makes these potentialities come true".
Related: What matters morally