You can't make your hair grow, but you can stop it splitting back and seeming not to grow so quickly by really carefully trimming regularly. Try to find a hair dresser who specialises in long hair ( they are about) or if you prefer to do your own hair twist it into inch or so wide section and VERY CAREFULLY trim along the LENGTH of it snipping the odd stray hairs you find there minutely. You can also singe them off but for goodness sakes be really careful if you choose to do this. Don't just go to the hairdressers and ask for a trim, they take tons of length off and really usually defeat the object, make sure they know you are trying to grow your hair. Make sure also that you condition well and keep it in excellent health otherwise it'll split and split and you'll never see any length gained. All hair shuts off it's growing cycle though at a predetermined point though so some people can grow their hair longer than others.