Ok so I have always had super thick hair. It just grows layer after layer. Ever since I was little I had naturally curly hair, about 4-5 yrs ago I cut most of it off.I went from mid back length to barley reaching my ear lulls. Anyways so after I cut it off the curl pretty much went away and just recently,well about 8 mths ago I noticed the bottom layer of my hair is curly again like it used to be but the top layer of my hair is super straight and any time I try to curl it with a cuing iron it won't work. So how am I supposed to get the rest of my hair ( top layers) to curl again naturally????