will it affect my new growth permanently?

hi, i am a 17 year old indian boy with with wavy semi thick hair. A month ago i had used used L'Oreal extenso straightening creame and maybe i kept it for more than 15 mins so it damaged my hair on the crown and other hair also became weak and i could pull out hair everytime and it came out with a white bulb at the end.. So i shaved my head.. Now i grew stronger hair and i can't pull it out.. But i can see the crown is not full of hair and has a lot less hair. Plus i an having dandruff problems too.. And i feel my new hair is a little frizzy too.. I am very worried about it.. Please tell me the solution for this! (This is a picture of my crown)

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