You cannot naturally increase bone length after growth plates close
Improve posture
Strengthen core muscles
Stretch regularly
Practice spinal decompression exercises
Maintain a healthy body weight
Sleep 7 to 9 hours nightly
Eat enough protein
Get adequate calcium
Get adequate vitamin D
Get adequate magnesium
Avoid smoking
Limit alcohol
Treat any hormone deficiencies with a doctor
Wear shoes with thicker soles
Use height-increasing insoles
Consider orthopedic evaluation if you suspect a medical issue