How to remove permanent brown black box dye without bleach

Ok I’m a natural blonde and I was feeling stupid and dyed it one night with fucking brown beard dye but it turned out patchy so I dyed it the next day w medium brown revlon color silk permanent hair dye and then I did it again with brown black hair dye of the same type. It doesn’t suit me at all and I don’t wanna use bleach bc my hair is still healthy and I wanna keep it like that and I don’t wanna use dyes again but does anyone know how to lighten dark permanent dye like a couple shades lighter? And does anyone know how long the Revlon color silk dye last?