How can I lighten my hair back to my original color?

My original hair color is a beautiful dark brown, almost black. However, for the past three years I have been dying my hair blue black.

I want to go back to my original color so I don’t have to bother with dying my hair over and over again. I don’t want to just let it grow out, because I think it looks tacky when my roots are showing.

Is there anything I can do just to remove the black from my hair that doesn’t completely destroy my hair? Would dying it back to my original color actually work, being that my hair is pitch black?

I kinda want to do this myself. I hate paying people to do my hair when I can do it just as well.