Flat hair

Taylor

So naturally my hair is thin straight and flat. I don't like it. I want thicker hair and for it to have more volume a little curl would be nice to but I can live without it. My hair used to be super long then I cut it and it made a little poofy but it didn't last long. Nowadays I have to hide it a curtain way to get it to look good for pictured. Are there any hair people that know what I can do for it