I have a thin hair from birth and I want thick hair? (Photo)

Minoxidil sheds occur when minoxidil dependent hair has grown. This does not happen in 3 weeks, it take much longer so you should be able to stop the medication now without worry

You seem to have black hair and have combed your hair so that the scalp is showing, This is not balding and anyone with your hair color who combs their hair this way will see their scalp. 

Steroids are used for the treatment of alopecia areata, usually locally injected into the diseased skin directly and it usually makes it bettter, not worse

We have offered scalp micropiugmentation as a cosmetic solution to thinning hair in women. A few members of my family have had it done, see below

I wish hair lass was that simple, just use headstands and yoga, but not this does not work as many have tried it and still bald

From what you are telling us, it does sound like a chemical burn may have occurred. I don't know what Keratin hair treatments constitute, so your would have to tell us what that entails.