Hair always grows but if it breaks faster than it grows (poor length retention) you may experience a growth plateau.
Improper detangling is the most common source of breakage.

Here's a video showing how to detangle Type 4 natural hair to reduce unnecessary breakage which leads to poor length retention. 

This is the detangling routine I use to grow out my hair. 

I'm currently on a hair growth regimen and my goal is to see if my hair can grow tailbone length. 

Join me on Instagram as I share all I'm doing to achieve my hair goals.