How can I thicken my low density hair?

For those struggling with thin, low-density hair, I'm curious to know: what are some practical methods for thickening hair? I've heard about hair growth treatments and conditioners, but are there any natural remedies or lifestyle changes that can help? Are there any specific nutrients or vitamins that should be taken? Also, is it possible to stimulate hair growth through scalp massage or specific hair care routines? I'm interested in learning about both temporary and long-term solutions that can help achieve thicker, healthier hair.