How to fix short thin nape hair?

I've been dealing with this probably for awhile now and nothing seems to be working. I've tried castor old, jamacian black castor, ors fertilizing temple balm, plus the hair fertilizer, yet nothing has worked to solve my thin nape hair. I also switch to using satin pillow cases. I use to think it was because I have low porosity hair and wasn't moisturizing properly. Once I fixed that problem it was still thin as could be. Does anyone have any suggestions?? Please and thank you!!

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