Recovering from the damage that occurs when hair is lightened is never easy (been there, done that, had the split ends to prove it).
Discontinuing coloring is a great start. Unfortunately, most of your hair has already been damaged. Trying to correct the damage is never easy. Reducing the blow drying and straightening will help. Being gentle with your hair will be very important. Your hair is most likely very dry. If you work at conditioning and moisturing the damaged hair, you can minimize the split ends and breakage.
Trim off the split ends (not necessarily the length of your hair, just the splits as you find them).
Consider oiling your hair at night. This will help to restore the moisture. Jojoba oil is a light oil that can be used for this. Don't use too much - just a couple of drops rubbed between the palms of your hands, then run your hands down your hair.
Try to continue to reduce the number of times you wash your hair. Twice a week is usually enough. Condition the ends of your hair.
Look at the ingredients in your shampoo and conditioner and try to use the mildest possible ingredients. Some hair does not respond well to silicone type ingredients - some loves it. If you feel the ends of your hair are stiff or crunchy, try a vinegar rinse to remove any buildup. Consider changing your shampoo or conditioner to see if you get better results.
Read through the suggestions on this site in the
Ultimate Guide to Growing Long Hair. Read through the other posts here for other suggestions.
Patience is the most important thing to growing long hair. Be realistic in your goals. Your hair won't grow a foot overnight. Visit us often and share your progress!