Most Helpful Girl
Boxed color does not lift dark color. You have to have your hair bleached first and THEN recolored.
The process is called "color correction" and it's expensive/time consuming because black hair color doesn't lift easily. It damages your hair too, making it feel like straw.
Do NOT attempt to do this yourself because you'll jack it up and then it gets even more expensive to fix. Schedule a consult with a hair dresser to get a quote on what it will cost. A consult is free and only takes 15 minutes.
The alternative is to just grow it out.