If you family permits a speech therapy then try to see a board-certificated, experienced and good-attituded speech-language therapist available for you. If doesn't, then you can try it at home on your own: Download a metronome app and practice reading materials following to the pace of it. The steady regimen of metronome is about 15 mins per day, 5 days per week and after 8 weeks you are likely to witness the effectivenesses, and remember that pace should increase from 90 bpm to 120 bpm gradually along the process. Hope that can help u a lot