Is Tikkun Olam actually an orthodox thing?

So, the Jewish ethic that one must repair the world and that nothing is more important than this life. where one’s primary goal is solely to improve the world, regardless of what comes after. That’s how I understand it.
I often hear that, unlike Christianity and Islam, the Jewish faith is not concerned with the afterlife at all, but rather with this life, and that one should enjoy this one life. My question is whether the Orthodox or Hasidic side of Judaism sees it this way or differently?