This is how I see it. A person has no obligations in life except death. It's the one thing you have to do. But that's boring; that's why life exists.

You should pursue what makes you happy in life, because happiness is what all people seek, right? Be it killing someone, saving someone, playing music, playing the fool, it's whatever makes you happy.

In this case, you should pick an productive activity that makes you happy; art, sports, cooking, anything. But you should make your subsistence unique; otherwise, you would have been born, emulated other people in the activity you chose, and then die.

In short, you should make your mark in history by creating something original before dying, which future generations will remember you for. Even if no one knew of your creation your existence was significant; only you were responsible for changing the world in some way; your life had meaning.