Please consider a low-sudsing shampoo or cleansing conditioner, which are less likely to strip your hair. In the US, Herbal Essences has a line called Naked with is free of parabens and a lot of the ingredients that can dry the hair out. Many people recommend Wen, but reviews are mixed and I have never tried it so I cannot give an honest opinion. But the Naked line is a good and economical choice. Ouidad also makes a gentle cleansing conditioner or co-wash; it is geared toward very curly hair, but is gentle and worked well for me when my hair was much longer. (At one time, my hair was knee length.) You do not need to shampoo often with longer hair, I found two to three times a week to be sufficient.
Once a week, try a good, deep conditioning mask--I like Paul Mitchell's, and have also gotten good results with Pantene. Also, Indian markets carry hair oil which makes a great deep treatment. I would comb it through to the ends (just enough to coat it, not dripping!) and put a plastic cap over it. Then you can keep it on a while and let it work with your body heat, or use either a bonnet or blow dryer. Then you shampoo it out, and the hair is left soft and fragrant.
Whatever you use, gently comb it out in sections, starting at the ends--don't rake the comb through or you risk breakage!