how we could make a planet best in the solar system

This is theoretical due to gravitation effects changes. If we combined resources from other parts of the solar system like Titan, Enceladus, and the Asteroid belt with Mars. We could make things work for earth two much better, but if we changed the masses too much it could make them move differently. We could probably keep them good exchanging the masses where it doesn't effect gravitation. The chemistry and mass exchange,gravitation calibrations could be catastrophic could be hard for terraforming the earth. We should only do it in uninhabited systems. Unless we move everything offworld and terraform the system to fit more livable planets.Even adding atmosphere to the moon could catastrophic. With a  small biodome more than few miles with artificial gravity we can even add a skylight. Nano gravitation may be the way to do that. We may just cause suction at till we balance the suction downward. We may also need to wear magnetic shoes. Doing this needs to be figured out and calibrated at small scale because it could affect the earth gravitation so physicists and sustainability mathematicians may be needed.