Waking of the Arda's Sleeper

Five years after the magical world’s destruction, Harry Potter, overwhelmed by grief, destroys the last remnants of life on Earth. Fearing the decline of his mind, Death puts him into an enchanted sleep to preserve him. A century later, Harry's core seals broke and his magic washed over the land and revived the world bring back life.As centuries pass, the world now known as Arda flourishes, and Harry's resting place is revered as a sanctuary, protected from all darkness. But in 2942 of the Third Age, a company of Dwarves and a Hobbit accidentally awaken him. Now, with his unimaginable power returned, one question looms: how will the fate of this world change because of one being?

This is a prologue so please give me some advice and help as its my first time writing. Also the name may change.