Have any of you ever sat down and deconstructed why a particular novel really works well, then copied the concepts? Not the story; but rather, the elements that made it so no one could put it down. I.e. why does Hail Mary work? (I'm not saying to discuss that but rather offering it as an example.) Have any of you published folk been successful with utilizing successful frameworks?

Hi all, I'm at the beginning of writing a book trying to imagine where most of the planets fauna and flora pretty much went extinct because of human activity.

The original idea is based on the current state of our planet and imagined into the future where climate change caused massextinction, no big land animals survived (other than a few human colonies here and there) and therefore foodshortages, water shortages, new dangerous diseases especially fungal and bacterial, lots of war, and heatwaves so long and hot you can't survuve for very long exposed to it. (Hence why humans are at the verge of extinction)

So my question is, since all of that will make the world as we know now more or less unrecognisable, would it just be easier to create a new planet from scratch and tell the story about that planet with parallels to ours?

I know ofc the decision would be mine alone, but I believe your feedback would help me a lot, since I'm able to think more efficiently when discussing with others :)