Hi! stylist here. These products are not made for semi permanent colour, and will not work as well as if you'd been using permanent colour, because of how the process works. You can do up to three rounds in a row, and can expect to get to about 4 shades lighter doing so, some have had better results, and scientifically, I can't explain this. Your natural colour will determine what colour you end up with, but I can say expect a medium caramel auburn in most cases when going from black
It is relatively safe to repeat the process, and I have done three times in a row on my own hair with only some dryness which was easily fixed with a deep conditioner one time.
All you can do is give it shot at this point, but be prepared to have to tone, or even recolour, you will not likely achieve your natural hair colour with this process, and anything that would accomplish it is much more damaging, and I would recommend seeking a stylist in that case.
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