Concurring with minimal shampoo. Also, try conditioning with natural oils if your hair is dry (coconut oil in particular, though don't let it clog your drain).

If you really care about keeping long hair in great condition, wear it up or braided most of the time. I don't have the patience or the desire for that, so I have to trim my damaged ends more often than some do, also.

(I am female, with waist-length hair; I think of wearing my hair down rather than up as akin to using the good dishes rather than letting them sit in the cabinet.)