looking biracial/mixed doesn't depend only on skin color and tone
features and other stuff also play a big factor
I also think the lighter you want to get , the more chances you have of looking bleached specially if you use harsh products
there is a huge difference between a naturally extremely pale person and a person that achieved the paleness through bleaching
the last one lacks undertones which is why they end up looking off and greyish
example
a naturally mixed light skinned person
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a black person that bleached/lighten their skin to an extreme
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they don't look mixed just black with an odd coloring
it's not impossible to lighten up a lot but it takes a lot of time and patient and one product won't achieve that look alone
it's a combo of skin building, peels, exfoliation, supplements and using natural products
and again even with the pale tone your features won't change so it's still possible for you to not look mixed when it's all said and done