GCSE English Essay. Help?? Details below :)

How do I get an A* in my GCSE english essay? It is about Macbeth and how commitment is shown. I also have to link it to the poems "They Did Not Expect This" and "A Woman To Her Lover". I have written 5 sides already, however my friends have written about half as much as me as i am a slow writer. I hope 'quality not quantity' is actually a thing. Any advice on how I could make my essay A* material? Thanks :)