Do layers make thin, fine hair look thinner?

I am wondering if I have too many layers as my hair seems to look thinner. It could also be that I am using the wrong products or both! What are the best type of layers for thin, fine 2c/3a hair? Is it better to wear hair longer or shorter to make it look thicker? What do you all think?
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I think fine hair in general, no matter what length, needs some kind of layers though...
low poo- GTT, 50\50 or whatever I have at hand
RO- CJBCS, TNVC, Suave Coco
Stylers-FSG & BRHG
PT (twice a week)-CJRM, Ion Reconstructor, SSPT
Type: 3b/3c (i), below shoulder length.
CO wash: A-O GPB LYY, Desert Essence Coconut, Oribe Silverati
Leave-ins: Curl Junkie Beauti-Curls, KCKT, cno overnight
Styling: BRHG, MGA Sculpting Gel, A-O Mandarin Magic Gel, LOTD AVG, LALSG, CJ Pattern Pusha
DT: Curl Junkie Deep Fix, Briogeo Don't Despair Repair!
SE PA
HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me, Aloe Fix
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Kathymack--do you need to wear your hair above shoulder length to avoid the stringy look? I think I might have the stringy problem too with long hair:(
I'm older. Thyroid and medication issues have REALLY reduced my hair density. It's thin and you can see through to the scalp in a lot of places. I wear it around chin length--the way it is in my signature picture. Sometimes and inch shorter, sometimes an inch longer. All depends on where I am in my haircut.
SE PA
HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me, Aloe Fix
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Yes, I take either "Hair, Skin, Nails" Vitamins or "Dermavites." I think it's made a little difference. I take another medication that lists hair loss as a side effect.
SE PA
HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me, Aloe Fix
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