Happiness is the ultimate currency.
That is a point I learned from a book called "Happier" by Tal Ben-Shahar long before leaving the cult. Most of what we do as human beings is in the pursuit of happiness. Sometimes we miss the mark, but that's what we're driven toward.
So what makes you happy? For me it's being with my wife, challenging myself, helping others to be happier, etc. So I do things to get me closer to those things that bring me happiness. Maybe there's no eternal mark I can leave on the world. Maybe there's no eternity for me. But I can try to be as happy as possible while I'm here, and I'm talking genuine happiness, not escaping. When I'm present and happy then what else could I ask for that's not a fairy tale?