Did you try to bleach it when it was dark? You can probably get most of the color out (since bleaching) with color remover (ColorFix, Color Oops, Color Zap, Igora Phantom). If you do that, you can probably dye it light brown. If it's badly damaged and you don't want breakage, leave it alone.
Because you say that you've dyed it many times, I would not suggest going blonde at this stage. That would require color remover, then bleaching and finally toning.
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