It's really difficult to increase the height after reaching adulth hood as the production of growth hormone slowly stops.
Surgeries and growth hormone administration will promote height which potentially dangerous and detrimental to the body. However with few tips is possible to add a few more inches ;
~Proper Diet and nutrition
Balancing diet with rich in
calcium,
vitamin D, iodine, magnesium, protein, etc include food items like egg yolk, fish, chicken, lots of nuts, pears, diary products, fruits like apple and bananas.
~Stretching Exercises like cycling, swimming, bar hanging, rope jumping, spot high jump etc.
~Expose to sunlight
Especially during early morning and evening hours. Sunlight is the good source of vitamin D which contributes to bone growth.
~Proper sleep
Fact that growth hormones does it's job of thickening and lengthening our bones during deep sleep. Correct posture is also crucial for proper growth