Hair turned grey after semi-permanent hair dye faded!!! HELP!!!

My hair is naturally black (asian hair). Then I bleached the tips and it was a light blonde. I used semi-permanent hair dye (dark purple). It is three or four weeks later and it has faded to a very obvious grey. Can I get it back to blonde anyway? I would like it to go back to blonde if I can. OR just any advice would be nice. Please and thank you!!!!

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Comments
2B/C, porous + colour treated, medium texture, normal elasticity, high density.
Hair: BSL, Thick, Low Porosity, Dense, 3A
HG's: Moogoo, Ultraorganics Intense Camomile Conditioner and Clear Henna Hair Wax, Sukin Conditioners, CO, Spray Bottle, Henna
Low-Poo: Moogoo Shampoo
Co-Wash: Sukin Nourishing Conditioner
DT: CHHW, ICC, CO
LI: Sukin Moisture Restoring
Colour: Henna