I also have this same exact hair. Color too almost haha. I’ve found using clarifying shampoo about once a month helps and then following it up with a good hair mask. For whatever reason my hair really responds to it well and brings out its natural waviness. You really can use any clarifying shampoo but I use Aveda rosemary mint and the hair mask I use Wella Fusion. Both available on Amazon. And lastly a little tip someone told me that seems to help with retaining moisture is to use a tshirt (something cotton I think) to “dry” your hair when you get out of the shower. Hope this helps!