Iterate through all collapsed(-ish) civilizations, if unknown figure out why they collapsed, and if altering history try to avert the collapse and see how far t

Iterate through all collapsed(-ish) civilizations, if unknown figure out why they collapsed, and if altering history try to avert the collapse and see how far they'd get. (Top of the list: Aztec, Maya, Rome, Ancient China) If the future is included: figure out the next collapse and avert it ;)