Want to achieve platinum hair

I recently box-dyed my hair for the second time a couple of weeks ago, and I’m considering going platinum blonde. My hair isn’t in bad shape—it’s soft, though the ends could use a trim. I think I can handle bleaching it without causing too much damage.

I understand that bleaching box-dyed hair can be tricky, so I’m open to going to a professional. However, I’m worried they might turn me down, which I’d completely understand given how unpredictable bleach can be with box-dyed hair.

I’m just wondering if achieving platinum blonde is possible in my situation. For context, my hair is currently dyed an auburn shade, and I’ve attached photos to show what it looks like. Any advice or opinions would be appreciated!