Agreed JBCO is great, however if naturally you have thin/fine hair, there isn’t much any product can do as this is down to genetics! So it doesn’t mean anything is wrong, but maybe consider different styles that can add volume, eg. Braidouts, bantu knots-outs
For getting thicken hair try dermalmd hair growth serum with this serum I have defiantly seen that my hair is becoming thicker in the areas that I’m thinking in. I would highly recommend following the instructions on how to apply. My hair feels healthier when I apply the product while my hair is still wet versus applying it without wet hair. Highly recommend this product!