At any given moment, the entire fabric of reality could be perched on your fitful consciousness and the world is only manifest because of you. Since you can’t be certain which moment it is, you are best served by acting as if every moment is that moment of great importance.
You’re shopping at Costco and bang your cart into a terrorist saboteur disguised as a chubby suburban housewife. You give him a look as if it was his fault you were crowding the aisle. This frightens him into thinking Federal Agents are keeping tabs on his every move and he abandons his plan to blow the place sky-high. You have just saved the world from a terrorist attack by shopping at Costco. You may never know you thwarted a nefarious plot – but when you believe your existence is vital to the planet, even small actions become extra special acts of valor in the bigger scheme of things.
Also, remember what Tolstoy said: “The most important person is the one you are with in this moment.” Given that recent circumstances have many of us spending more time alone, you need to factor yourself into that equation.