My natural hair colour is med brown but I died it a few times VERY dark brown. Ive used colour B4 on it three tines and it didn't work. I used a pre-lightener and now my roots are light blonde and rest of my hair is patchy and orangey. How can I make my hair look more natural and light brown, without going to the hairdressers? What should I put on it?

You should put lemon on your hair then go outside and let the sun shine at your hair uhm maybe 2 hours but much better if 5hours :)