How can i make my hair grow longer faster?

I have semi-long hair but I really want it to grow longer. It used to grow very rapidly but has seemed to halt at this length and isn’t growing as fast as i’d hope. Any suggestions?

Please don’t suggest mane and tail horse shampoo. I have horses and it doesn’t make your hair grow any faster, it only stretches your hair cells, making it appear longer but it doesn’t last.

How to make hair grow faster