Yes, I grew mine out a couple of years ago, I used a silver shampoo, which is bright purple when you tip it out of the bottle.
However, once you've done it you realise this could be your colour for life and it does look drab on Winter days.
In our psychology blonde hair is associated with beach days and sun, which is more cheering.
And this may sound shallow, but sadly is true if you are still working you need to project a youngish image.
So.....during lockdown I tried a box colour to do fine highlights. Bought a plastic cap online, spent a lot of time pulling through fine streaks, then applied the colour.
Pleased with the result I have now.