What can i do to make my hair longer?

Lots of factors: don’t overuse straighteners/curling irons/tight braids/chemicals; trim ends periodically; healthy diet with adequate protein & fruits/veggies; consider multivitamin & biotin supplements; consider Dr visit for eval & thyroid & other blood tests if concerned

Length of hair, like many other characters, e.g, height are genetically determined and you may not be able to lengthen your hair. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health!