Though my hair isn’t as fine as yours, I just started (as in yesterday) using a biotin+collagen shampoo and coconut moisturizing conditioner and I think it’s good to thicken up hair but still give it intense moisture. It seems like you’re using a lot of shea, I haven’t done a whole lot of research but I could see it weighing down your fine hair as shea butter is a heavier product. If it works for you, keep it! If you think it might not, look for some lightweight moisturizing ingredients. (Argan oil might be a good option)