Fine, wavy (sometimes very curly in humidity)- looking for products to encourage more wave/curl

Hey! So I have always had mainly wavy hair that sometimes gets very curly in the humidity, but because it’s not yet humid I am stuck in the in between of wavy/straight/sometimes-an-odd-curl and I was looking to find products that encourage my hair to be as wavy as possible without getting weighed down or feeling gross, I find my hair gets greasy every couple of days so I shower everyday in hot water and wash about every other day. I’ve tried products for curly hair but they tend to weigh my hair down. My hair is not treated and is pretty short at the moment which I would think would also encourage the wave/curl of the hair but it just does whatever it wants and sometimes it looks good, sometimes it’s not so good. Does anybody have any recommendations without sulfates or parabens(cost effective would be great bc I am in school rn)? Lmk if I left anything important out, thank you!!