How to take keratin out / can I revert 100% back

okay I'm a 14 yr old guy. I don't know if that affects anything, but I recently had a keratin treatment. Like a month ago, I don't know the difference between the types of keratin. All I know is that it stunk. On the first day not even an hour after I got I washed my hair cause I really didn't like it. I think I used shampoo or I didn't cause I was scared that would make it worst. But now I'm reading to put shampoo with sodium chloride in my hair. I wanted to know how I can revert and how long it'll take. ( the picture is from before the treatment )

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