Some kind of alien enemy maybe? It was a long time to my brain ago! I think the valley was less technologically advanced than where he was before and he was a strategic planner for their defence.
Some kind of alien enemy maybe? It was a long time to my brain ago! I think the valley was less technologically advanced than where he was before and he was a strategic planner for their defence.
https://storiesonline.net/s/60480/i-was-a-modern-caveman
Heart attack while driving, crashes and dies.
Aliens drop him back into the stone age.
Echoes, by Sea_Life?
https://storiesonline.net/s/55343/echoes
MC starts off in a do-over, and learns he's got something different about him and an obligation to save everyone in the Columbia River Valley.
I thought of that one from the start, but the "less technologically advanced than where he was before" part killed that, unless being sent back 40 years into his own past qualifies.
The "strategic planner for their defence" requirement also does not really apply, although the "alien enemy" does.