At that point, and with that much time, and assuming we live that long, I imagine humanity could park a larger asteroid slightly outside of Earth orbit to gradu

At that point, and with that much time, and assuming we live that long, I imagine humanity could park a larger asteroid slightly outside of Earth orbit to gradually grow Earth's orbit outwards. Of course that would take a while, but a "while" is a relatively small amount of time when you're talking hundreds of millions of years.