You got it, your wish, you made the perfect wish, nothing, nothing can kill you. Yay! Right?
Over time you met other people who made similar wishes, but none, none made the perfect wish. With time something took them out. Memory overload killed Brian, a new universal plague got Melissa. And so on.
You became a god in your own right. Willing or unwilling you become a figure of worship to many cultures as time and people reset. You’ve met the same people with slightly different values and beliefs but overall the same over so many resets. But now, now the universe itself has expanded to far…
The heat death started from the middle, the big black hole in the middle finally collapsed. And with it came to end of everything. Stars grew, expanded, contracted. Reached their super nova stages, but most never reformed. You kept travelling farther out and farther. And there standing before you…
The last white dwarf, no the last light giving object, the last possible source of life, floats before you slowly dying. You’re sat on an unmoving comet. Nothing really moves anymore unless you’re the one applying force.
It’s getting colder and colder and darker and darker. All the atoms of reality are plot so far apart they can’t recombine into new things. It’s been thousands of years, hundreds of thousands, millions, multiple hundred of billions, but here you still are, finally and completely. Alone.
It’s starting, or ending rather. It’s fizzling out, going from white, to brown. This is the end. Its last sputters of life fade and everything, for the last time goes dark.
It’s 0 degrees Calvin now, everywhere. Absolute zero. Nothing moves, nothing spins, nothing happens. This your penance. The prize you receive for making that wish.
You lay back on the comet. And look in the direction you have arbitrarily chosen as up. Nothing has been there for so long, nothing is there now, and there will be nothing there ever again.