With an estimated average distance of 10 billion light years between galaxies, if there were only one intelligent species per galaxy, they would only likely have a chance of meeting if their respective galaxies got close enough to collide.
We can probably test that hypothesis in about 4 billion years when the Milky Way and Andromeda galaxies are expected to collide (Better check whether your car and homeowner insurance policies cover such galactic collisions.)
I said guess, not bet.
And I do have the Fermi Paradox on my side.
To anyone who says I’m wrong I say:
Show me the aliens!