Calling all Beauty maniacs I need hair Help QuicK.!?

Okay well I litterally cut my hair by myself a couple months ago and it turned out bad and so I had to get cut into a bob and now it grew out up to my shoulders and I want it to grow longer and I need tips and advice on how to grow it longer and faster before September. Also, I been eating a lot of foods that aid in hair growth and even tryed some supplements . Well if you have any other tips and advice on what I should do it be really helpfull thanks.:)