My hair needs some serious help.?

I've used many flat irons. I curl and straiten all the time. In November I got a chi flat iron. Using it to straiten was great as always. But curling it was the problem. It curled great but when I washed my hair, it went strait. My natural curls were completely gone. I'm aware that I broke the hydrogen bonds in my hair. All I want to know is, is there a way to fix it? Or is my only option to just let it grow out?