The following may be the reasons for your slow height:
1. Lack of sleep or too late
2. Lack of exercise
3. Incomplete nutrition
4. Eat "junk food".
5. I am in a bad mood.
You should sleep regularly and do proper exercise every day: stretching and bouncing are most beneficial to your height, and nutrition must keep up. You can eat five kinds of high-quality food: spinach, sardines, carrots, milk and oranges. Keep a happy mood and grasp the increase in these 2.3 years.