Edit and Improve Proposal Writing

I need a person with excellent writing skills to improve a proposal document that I am writing. Once I finish the majority of the content, I need the flow, grammar and impact of the proposal to be improved whilst keeping close to my natural style. I also need someone who is available for quite a fast turnaround - we may need to do a bit of back and forth over the next few days.

Please attach any work that you have done that is similar. Only apply if you are strong English writer, native English speakers preferred.