Often long hair can look a little lifeless if it is not well conditioned and maintained. When hair is long it pulls down and affects the natural movement. Therefore it is advisable to try different lengths and implement layers and forward graduation, which is shape around the face that creates a lighter feeling in the hair. The other option is to have a digital perm, only if your hair is in a virgin state (not coloured), which allows for natural looking movement whilst maintaining all your length.
Best of Luck!