How to protect the Earth from the stellar evolution of the Sun?

Every day the Sun is closer to be a Red giant, making the live of the initial home of the humanity practically uninhabitable. Humans are not there anymore. It's a protected territory, but the Sun gonna end with that and we need to do something.

What humanity can do? There are a way to save the Earth, their flora and fauna from their own star? How much that solution gonna last?

Humanity is dispersed around the Universe, has acces to a really advanced technology (you can be creative here, but respect the physics as much as you can) and all the resources from closer stellar systems.

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How to protect the Earth from the stellar evolution of the Sun?

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