A trillion tiny lightsails are carried off into the void. Within each is the DNA of a billion different species.
It's a bit like a blossom's pollen being carried to the winds.
When we were younger we arrogantly believed that the stars are our destiny. But the universe doesn't favor a single life form. Life's a thing that spreads and adapts.
We weren't meant for the stars. It took us millenia before we learned that we are simply a part of the Earth.
With it's seeds spread, the Earth withers and dies, as blossoms do once their job is done.