My hair growth has hit a plateau. I have 4a/3c hair. How do I make it grow again?

I did the big chop over a year and a half ago. My hair grew back quickly after. Then I decided to color my hair from a 2/3b to a 6vr abt 6 months after my hair grew back. It has sense hit a plateau and has barely grown since then. It stops right before my shoulders. I have kept it braided for several months, I deep condition between braid styles, I tell them to braid loose or have large box braids, and keep my hair oiled and conditioned and still barely any noticeable growth. What should I do? 

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