I recommend a shampoo for soft, damaged hair.

This is J.Forest Silk Keratin Shampoo. Doesn't the name alone make your hair feel soft and smooth? Haha. It comes in a massive 1L size, and it is a total gem!! It is specifically designed for damaged hair, but you know you can use it even if your hair isn't damaged, right? Haha. What is unique about this is that even though it contains a ton of nourishing ingredients, it is transparent. Also, it feels thinner than I expected. Usually, nourishing shampoos tend to be quite thick, but this one isn't quite like that. When you use it, it feels slippery and sticky, and it really feels like your hair is coming back to life.