The phrase Tikkun Olam has become perhaps the central Jewish observance of those who have left other observance and mitzvot behind. To be sure, it’s a very important description of our work as humans, and more specifically as Jews, in this world.
It’s largely become defined as “social justice”, which itself is a very important, although difficult to define concept. Our Torah indeed teaches us the value of every single human being (often defined as corresponding to a universe!) and we also have traditions and halachot that lead to living in balance with the physical world, including the ecology of our planet.
We need to remember that an essential step in repairing and rectifying this world is the return of the B’nei Yisrael, the people of Israel, to Eretz Yisrael, the land of Israel. There is no Tikkun Olam without this.