How can i make my thin curly hair thicker.?

I have really thin curly hair about shoulder length but i cna't really do anything with ti but put it up cause anthing else makes me look weird cause my hair is so thin i want it to be thicker cause i can probably take care of it but iwant to do different syltes with my hair but i can't if it;s soo thin. please 10 points for best answer wiht product.