But I'm also a radical individualist and something of an existentialist in general philosophical terms. And as an atheist I believe that there was nothing but oblivion before I was born, and will be nothing but oblivion after I'm dead. So all that matters is what happens "goal line to goal line" so to speak. So I choose to live a life trying to do the things that matter to me and that satisfy my own beliefs. But I'm not arguing for pure hedonism or anything. Part of what "matters to me" is exactly "leaving the world a better place", and I hope that something I do in my lifetime has a net effect of making that so, even if in no more than a microscopically small sense.
That matters, that matters as we play our part and we become part of the intricate workings of the universe. We become a small but important part of the universe, without us, you and me, the universe would be a different place.
The universe is a vast collective of matter, antimatter, dark-matter and us. So much matter that we sometimes lose sight of the most important matter in the universe, in our existence. That being the abundant but regularly overshadowed doesn't matter.
Doesn't matter constitutes the vast majority of our lives. Be it sleeping, eating, shitting or dying. It doesn't matter is what shapes us and our lives, no one cares. And that doesn't matter.
Personal relationships, volunteer work (currently with under-18 youth), watching the stars/sunset/sunrise, speaking a non native language, learning etc are all enjoyable facets of life as well. So much more
Saving up money to buy land and start homesteading off-grid
similar question.