Hair coloring disaster!?

So I have been coloring my own hair for YEARS. But I don't want to keep damaging my hair with hair coloring with harsh chemicals or hair color strippers that also have harsh chemicals. I just dyed my hair blackish with purple streaks. I'm not into it at all. I'm a hippie type person and I normally have light brown hair with highlights. I want to take it out but in a natural way. I have tried using lemons to lighten it but it only lightened my roots. So I need to find a NATURAL way to strip my hair of the black color. And also, any ideas on how to make a remedy to put highlights in? Any help would be GREAT.