You cannot permanently increase your height by a meaningful amount in 1 week if your growth plates are closed
Sleep 8 to 10 hours every night
Eat enough protein every day
Eat calcium-rich foods
Get enough vitamin D
Include zinc, magnesium, and iron in your diet
Drink enough water
Do stretching exercises daily
Do posture correction exercises
Practice hanging from a bar
Do yoga for posture and flexibility
Avoid slouching while sitting and standing
Wear shoes with thicker soles if you want to appear taller
Avoid smoking, alcohol, and junk food
See a doctor if you are still in puberty and want to check your growth potential