Hi! I absolutely love the Elysian series, and it would be so sad if you erased everything just to start over. Since your new ideas are such a big shift, why not keep this original version as it is and publish the rewrite in a separate book?
That way, you don't have to 'scrap' anything. You could treat the new book as a different story. It gives you the freedom to experiment with it without losing the progress and the characters we already love in this version. Plus, if you ever figure out the current ending while writing the new one, you can always come back and finish both!