What else should I use? Or what should I change?

try a shampoo and conditioner that is designed for the colour of your hair. i tried mc adam range and my hair is back to being nice and healthy. also try to lay off the styling products everyday as this doesnt help. also get a hair mask once a week this will help put moisture back in the hair. one more thing get you hair trimmed every 6-8 weeks. hope this helps . ps if you do use the irons every day turn down the heat. it takes longer but you wont keep burning your hair and making it look dull and lifeless