OVER correcting can cause progression of myopia, one reason that glasses tests (refractions) should be done after the pupil is dilated and the focus muscle relaxed in young people (cycloplegic refraction). Myopic is also made worse by not playing outside enough and prolonged near tasks especially hours and hours staring at video screen on computer, iPhone, iPas, videogames, etc. Give your eyes a rest. For rapidly progressing myopia dilute atropine or bifocals might be tried.
There are studies that indicate a benefit of ortho-K. Most are done by optometrists not ophthalmologists and have a financial interest in it as it is expensive. As mentioned above: playing outdoors hour/day, not over-correcting, bifocals, dilute atropine eye drops are what most pediatric ophthalmologists recommend.