Hey I have hair that's Light brown that naturally turns honey blonde in the summer, I tried lemon juice and it did help(I wanted to be blonder) it just brightened not lightened my hair. Sun in works (but mostly for lighter hair colors , it makes darker hair colors red or orange(if that's what your looKing for), honey also is good

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CG/LOC Method's 3b/3c hair SL-Curly/ Goal-MBL Curly
Weekly Poo/Low Poo: some Shea M Poo.
Weekly Deep Treat-Dermorganic Intensive Hair Masque
Bi-Weekly RO:Tresseme Naturals - V.Smooth/N.Moisture
Daily Leave in:Shea Moisture Extra Moisture Detangler
Daily Oil: Olive Oil & Conut Oil Mix
Daily Styler: Shea Moisture Curl & Style Milk