Transitioning from thin to thick

My hair has thinned out due to stress and damage. The past two years have been really stressful and on top of that I've gone through many stages of dry and damaged hair and one of oily dandruff, all of which I lost a lot of hair. My hair has really thinned out. I was looking at it and you can see my scalp like crazy now.
Does anyone have any advice on how to grow it thick again?
Does anyone have any advice on how to grow it thick again?
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3A/f/i
Super baby fine hair, low porosity
Shampoos: SM Fruit Fusion (mostly), Avalon lemon (to clarify). Occasional aloe vera and glycerin to wash.
Stylers: Intelligent Nutrients Perfect Hold Hairspray
Treatments: Catnip tea, IA girl's PT, Fermented Rice Water, Catnip Tea, Amla tea, Irish Moss, SS PT