Do NOT highlight your hair – it is one of the most damaging things you can do to your hair.
Color your hair (with semi-permanent hair color such as Clair Natural Instincts) as infrequently as you can get away with, such as once every two or three months. Only color where you need it most. In between all-over hair coloring with semi-permanent color, use a non-ammonia, non-peroxide hair color (such as Clairol Loving Care).
You do NOT have to cut your damaged hair off! Using the above regimen will repair your hair over time. Having to cut already thin hair is demoralizing and totally unnecessary. It helps to trim the ends every 4-6 weeks to reduce split ends.
Always use a heat protectant product if you style with heat. An excellent one is “It’s a 10 Miracle leave-in product”. It is also a detangler, controls frizz, and reduces hair breakage.