Okay well you need to be brave (or in my case foolish) to do this: My hair is clean white - I always coloured my own hair light brown with bleached highlights and it was in a pixie cut - at start of lockdown I died it dark brown and grew it while the hairdressers were closed - it was a real mess, all different lengths so I fastened it up and used hair scrunchies (not fabric ones, ones made of artificial hair) to create an updo. Actually it looked quite nice - think Sophia Loren. Once I could get back to the hairdressers I had it cut into a bob - so the style was okay but I had to dye the roots every two weeks and really wanted to go white all over.
So.........I googled bleach bath on you tube and slowly and gradually lightened it by repeating every 3 weeks or so until it was platinum then used silver shampoo. Tadaaaa - silver fox. I get so many comments, but yes, my autumn colours don't suit me any more, had to rethink my wardrobe.