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I have read several science fiction that terraformed Mars... the problem with most of them is the lack of a magnetic field and gravity, which leads back to the issues Mars has now.
Dome/roof over the Valles Marineris. That would provide lots of new land, contained atmosphere, could do orbital mirrors to help warm it up more consistently, and would not be trying to do all these things to a whole planet. Sure, it would be no trivial thing, but neither would pushing asteroids and comets to impact with Mars.
The soil can be cleaned and once you have the perchlorates, they can be used for obtaining oxygen and other uses.
One of the main features that future terraforming programs will have to take into account is that Mars already contains greenhouse gases, such as the well-known CO2. If work is carried out without taking into account their influence, then the planet can be heated too much. As a result, instead of Eden, you will receive Venus.