So my hair does not grow ! It used to grow, when I was a teenager! It was long and I cut it into a bob and it never grew back 
The longest it gets is just past collar bone so like armpit length. It's not particularly dry, I don't ever use heat on it, the most product it had on is hairspray and dry shampoo as it's quite fine and needs some help. I just don't know why it won't grow ??
Will olaplex promote some growth?