350603 SEO for 8 year old website

I have a well-established business based entirely on an 8 year old website. I have performed extensive on-page and off-page SEO. As a result I am on [login to view URL] page 1 for most of my keywords but not the main keyword. I also trail my competitors although I have more indexed pages and backlinks and better on-page SEO. I need an SEO expert to come up with a plan which I can then execute for securing better rankings so I can realize the full potential for this business. Give me a price range and information about your experience and I will supply full details. Then you can provide a specific bid and I will make a decision. I would like to select someone on Sep.17 and receive the completed plan by Sep. 23.