Well,I'm an asian junior high school student and my natural hair color is black but a little bit brown since I'm a chinese.

Question is I wanna get a red (or at least more red than now) or even brown hair naturally.Because I can't dye my hair because of school rules.So is there anything I could do so I could get a red hair and weaken my black hair pigment and replace it with red pigment instead?

Thank you so much for reading my question.Please help me as much as you could do.I'll appreciate it no matter what answer you might give.Thank you.