“What matters” is a strictly personal decision. Only you know. But, as we grow older, it becomes apparent that choices matter and not spending your time in a way that moves you forward, that reveals your aspirational self, is a disservice to you. We all need to own our personal journey.
Even if really, there is no “Ending”. There’s just more negotiation with the infinite. As you grow, your definition of success grows. Like Sisyphus pushing the rock up the hill, only more edifying and if you’re lucky, fun.
Nobody questions that life is too short to do something that matters. The question is, why aren’t more people actually living it.