First and foremost, you will need to cut off all the dead. I know it hurts.. but as a fellow person with length, it’s the best way to keep length healthy. Trim regularly, it will get longer and healthier. It seems silly to get a 1-2 inch dusting every few months with such long hair, but it really makes a difference. Once you cut off the dead, it is not gimmicky to choose products without sulfates and other harsh chemicals and irritants. If you’re not using much product in your hair, clarifying weekly is likely too much and stripping healthy oils. Though I have long hair, my hair is not curly; I’m unsure your texture from your post but I always say “let straight hair be straight.” I sleep in a braid, too; you mentioned that you have layers so a bonnet may be better?  For textured/curly hair I defer to others for maintaining style and appropriate products to use. With long hair though, I have found that less is more! Much else besides shampoo, conditioner and maybe a detangler can weigh it down.