It would change nothing for me... The universe is almost infinite , that's most likely the same coincidences and conditions on earth happened somewhere else, so I just would be "ok I knew"... But I'm not sure if we will ever get in contact, you can't travel faster than light and if they are too far away we will never meet... There's still the Fermi paradox, looking at humans, it's most likely to happen for us as we are a dumb specie
Regarding the simulation, I think it's most possible the time paradox where it's all already written for you