you have to bleach it again, the best thing to do if you need multiple rounds of bleach is to bleach it to orange, and then spend a week deepconditioning it, then bleach it some more! once it gets like, banana-peel-inside yellow, it's light enough to do toner on it. Depending on how thick your hair is, the bleach will really ruin it. Theoretically, it is BAD to bleach over the same strand twice so be prepared for breakage. Are your ends lighter than your roots right now? because if they are, then you probably don't have to wait for the dye to grow out. You should wait a long time before bleaching though if you like your length, because you will need a good trim afterwards- that's basically a given,
Maybe get the first time done in a salon, and then try to keep up at home?