To start with, I understand you use heat to style your hair? If so, I would advise you to stop it. It damages your hair even more and makes it brittle and dry no matter what products you use.
Then, for that small spot, if you have castor oil, massage your scalp with it at least twice a week and leave it overnight covered by a plastic cap.
Wash: after you comb your hair with conditioner, turn your head down, apply more condish till you feel your hair kinda smooch and crunch your curls. Put your head up, finish your shower and then put your head down again and rinse the hair with the water as cold as you can.
Do not comb or brush your hair anymore. Put your products (you have good ones BTW) and use your fingers to style your hair.
When you go to sleep, put your hair on a ponytail on top of your head and cover it with a satin cap. If you don't have one, try to use a satin pillow. In the morning take it down and style it with your fingers and, if you need, spray it with water mixed with vegetable glycerin to keep it moisturised.
You will have curls more defined.
I apologise if it doesn't work because every hair has its own needs but give it a try for a week or two and you will see.
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