You can just add an atmosphere and refill the oceans.
No
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Totally doable
Doable but not like that. A planet is a live organism with cycles of activity.
How do you know its alive?
Now it's in hibernation mode. Both Venus and Mars were awake in the past. Mars will be inhabited once more, but not by creating an artificial atmosphere and such.
Your limits are only a product of your own imagination.
