That is a task bigger than creation. It will be easier to build anew.
Perhaps! But failure, the best teacher is. As the Biblical YWHW learned in the old stories when he tried to drown the world in flood and start over, simply starting from scratch is a recipe for making the exact same mistake over again.
But he didn't start from scratch.
After the flood he specifically mentions that mankind is basically wicked. Maybe not by design, but the problem was the one thing he made SURE to import into Earth Revision 2.
Thst's not restarting from scratch, that's shooting yourself right in the foot.
So, failure may teach, but what you really need is an editor. "This part needs to come out, it ruins the entire plot."
"But i spent so much time on it!"
"I know! That's the point! You're kicking people out of the Garden, and what was happening in Siberia?"
"The Mammoths went extinct."
"And what happened while you were having a hard time with Cain and Abel?"
"The North American horse disappeared."
"See? I recommend removing that whole subplot."
"But thry're my favorite!"
"Then say goodby to yhe Tasmasnian tiger....."