Hair is not growing as long as it used to... what to do?

Alex

As I’m getting older (which isn’t even old, I’m 31) my hair won’t grow as long as it used to. It’s healthy, no chemicals or heat are used. I try to stay as au natural as possible. I’m white with curlyish/nappyish hair. Don’t use sulfate and rarely use shampoo (usually a cleansing conditioner) it’s a difference of about 2-3 inches. What do you do when your hair length has hit a wall?