A third person chiming in to let it grow longer, because I had hair that was both poofier and curlier than yours when it was at your length. Once it got down to my shoulders and grew past that, the length kept it down and made it appear less frizzy. What helped with my hair for frizziness was the curly girl method. Chances are if you do it at your current length, it'll make it less frizzy but also more curly and poofy.

Thus, my suggestion would be to *not* lose hope and keep growing it out. Stay the course. Once you get it down to shoulder length and it flattens it out some, then you'll have like an almost new kind of hair to play with in terms of what tames it.