Book Launch e-mail marketing

I'm using the Mailchimp list of 6,000+ subscribers, who know me very well, but I have neglected the list for over six months while writing a book. I tried three consecutive emails to warm them up and engage them in the book launch but the opening and click rates were very low. The book launch is scheduled on the 23rd of November. Therefore, I am seeking an email marketing expert to help me warm up the the subscribers list and increase their response within three weeks. I would be happy if I could re-engage the group and produce 30% of the Leads in the book pre-launch campaign. I think the process may require exceptionally attractive Mailchimp campaigns. I'm expecting a simple design, such as seeing an image of the book with my name or image in the email body, which may motivate the prescribers to open and respond, and will significantly impact the outcome. I can go for a fixed price for the project or working per hour.