What are your tips for thinning hair/receding hairline?

I want thicker and healthier hair but need advice. I use a wooden comb, like I was advised to. I don't tie my hair up tightly anymore, in fact I try to keep it down 24/7. However my hair is thinning out a lot (I'm in my early 20s). I don't tie my hair up because whenever I do you can see the hair loss on both sides of my hairline - near my temples.

Any tips and tricks for stimulating hair growth?
What are your tips for thinning hair/receding hairline?
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