How do i make my hair thicker.?

mane n tail original shampoo tends to make my hair feel thicker and the conditioner makes it more poofy. for the spike things, i'd suggest a putty or wax and not a glue because glue will make it stiff and piecey. with the putty, put it in your hair and blow dry it upside down and then you'd probably need some extra hold hairspray to keep it sticking out like that. but i'm NOT an expert, i've just tried a ton of hairstyles.