Hi, Welcome to Health care magic forum.
It is high time thinking of this matter, of height. Beyond 18 it is impossible to have increase in height.
Still if you want to clarify, you can consult an orthopedic surgeon for it. You may have to get the Xray of the ends of the long bones to confirm the closing of the growth points there.
If by chance they are active you can try to have the increase of growth by medical treatment .
I usually prescribe to my patient with such condition, injection of
anabolic steroid periodically,
protein supplements preferably complan,calcium, multivitamins, hematinics.
Take more of green leafy vegetables, pulses, sprouts, and protein rich foods.
Wishing for a quick and complete recovery. Thank you.