I think when you said "I've dyed my hair back" you meant "I've dyed my hair black"? If so, you cannot lift color with color, so you won't be able to just dye it back to light brown. (If you've dyed your hair a color besides black, that may change things).
Unfortunately, if you did go black, that's going to be really tough to get rid of. You can try a color remover like ColorFix, which you can get at a beauty supply shop, but I have to warn you it doesn't always work on black. It is low in peroxide and is at least safer than bleach. It will turn your hair either orange or yellow if it works (if it doesn't work it'll stay black), then you will be ready to dye over it once you've colorfixed it all one color. If you wind up with yellow, you'll need a brown dye with a violet base, if you wind up orange, you'll need a brown dye with a green base (you can see bases written on dyes at the beauty supply shop, I wouldn't recommend box color from the drug store because you don't know what the base is and it might come out funny colors. Be sure to test strand everything before doing your whole head to avoid any mistakes before they happen (which are harder to fix). Even test stranding the colorfix is a good idea, because then you'll know before you'll do it if it will work and how many times you may need to do it. And you need to test strand the brown dye not only because you need to check for funky colors, but because you want to make sure its not going to oxidize back to black with the peroxide (sometimes that happens).
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