Internet marketing, sales, advertising for a self published book

My name is Emeka, I wrote my first book 6months ago which I self published, I have had quite a bit of publicity many from print media, which helped with my sales at the time, as time has gone on things have slowed down, I would now like to make more people aware of the book.

I would like someone who is experienced in internet marketing and sales because I want to make sure people are aware of my book and the message it has.
Someone who can help me really push the sales of the book to the next level.

I have had positive feedback from Guardian, academics and politicians, so just need an expert to help me get the book out there even more.

Information about me and my book:

About the book: Consequences – Breaking the Negative Cycle is a valuable practical guide to communicating and connecting with young people at risk of becoming involved in gangs and crime. It’s about how to boost self-esteem and confidence, how to stimulate ambition and aspiration, and how to broaden horizons. Emeka has distilled into this book the wisdom and expertise gained from his own experience in dealing with gangs as a youth, and how he avoided becoming part of the negative cycle (he’s now in his mid-20s now), his leadership of the Consequences project and his liaison with Homeboy Industries gang rehabilitation in Los Angeles. Consequences– Breaking the Negative Cycle is also a personal voyage of self-discovery, showing how learning about his own roots gave Emeka the solid base from which to positively engage with the world and help others.