I kind of like the concept in one of Kim Stanley Robinson’s novels where they build a completely opaque planetary sunshield in front of Venus and freeze all the co2 out of the atmosphere. Then they have some kind of foamed concrete insulation/pavement over the entire surface of the planet to keep it down when they open the sunshield back up. Lastly, they wind a superconducting coil completely around the planet, pole to pole, and use it to create a motor in the sun’s magnetic field to create some rotation