Well, rewriting a first draft can be done by focusing on clarity and consistency. Make sure your ideas are presented clearly and that there are no contradictions. Also, get feedback from others - it can give you new perspectives and help you spot things you might have missed.
To rewrite your first draft, think about the story structure. Check if the beginning hooks the reader, the middle keeps them engaged, and the ending is satisfying. Also, look at the dialogue - is it natural and does it move the story forward? Revise grammar and spelling mistakes too.