How to should i fix a BAD dye job. Please help.?

Naturally my hair is dark dark brown if not black, so i died it brown..then liike 6mo my roots were really grown in i decided to dye it LIGHT brown, of course it didnt turn out. The top of my head and the side are lighter than the rest..its almost a copper color. i was thinking of dying it deep red/burgundy ishh.. idk how should i fix this??