Dear Jesusgirlkk,
I have never read any of John Piper's book. So I read the synopsis of the book you have told us about and it is very intriguing. I can't think of any authors that would pertain to his writings but there are some teachers ... good teachers that I enjoyed reading that I'm sure you would too.
They are John & Lisa Bevere, Max Lucado, Beth Moore, Kay Arthur, Priscilla Shire, and Joanna Weaver... to name a few. Oh my heart for you my dear one is that you will grow deeper in love with the FATHER in Heaven and that your heart will be filled with His purpose and love.
Blessings & love,
Snowrose