4 billion years they said. 4 billion years until the Sun would die.

Humankind has managed to reach far greater expectations than we originally thought. Our race managed to survive 4 billion years, we have all managed to make it to the end of our solar system. When the Sun would collapse, when the planets would burn to a crisp, we are here.

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So, to sum it up. You are a human on earth 4 billion years in the future. Scientists have assumed that the Sun would collapse at this time, the Sun hasn't expanded, it turned more so into a White Dwarf, and Earth is hurdling rather close. The Sun is coming to an end.
Our world is slowly heating up, there are more deserts than forests and people are starting to die of heat exhaustion. Our technology managed to deteriorate and now we are back to the time of nomadic travelers.

How will we survive our last days?