Go darker. Try mixing in dark brown with reddish brown(equal parts) and equal parts developer. What ever color you do NOT mix with the developer may be saved for the following month. Leave the color on 45 minutes on the new growth. Be sure to dilute the color mix by half with water to apply to the previously colored ends. Never apply color full strength to the previously colored ends. Use a sulfate free, castille free, tea tree free shampoo.