Big chop

So I recently cut off about 18” of my hair which is a hell of a lot of hair for me, it now falls a little above my shoulders when it was almost down to my butt! It was super super damaged and I needed to do it so bad but I lovvvve my long hair and it took a long ass time to grow it that long! I’m looking for tips to help my hair grow faster! I wanted to take biotin but I’ve heard people say it breaks your skin out and I have acne prone skin so I don’t know??? PLEASE leave tips and tricks down below, I’m desperate! (Sorry don’t know which group to put this in??)