Really damaged hair!!!!?

Hello, I have pretty damaged hair. Every-time I go to a salon they tell me I need to cut all may hair off and my hair is really damaged. I have longer hair and really do not want to cut it short. My hair is so damaged because I have wavy, thick, unmanageable hair that wont do anything normal unless I strengthen it. Thus, I go about straightening my hair just about every day. I use a heat protector, deep condition, and keep the heat on low. I try to get in a routine of only washing my hair every other day but I can't stand how greasy it is the "skip" day. Is there any advice of other things I can do to get my hair back to a healthier state or at least not let the damage progress anymore?