I was thinking about this last night, last weekend I was with two friends, both now blonde, but were both brunettes in their younger years, they only went blonde when the greys got too much.
friend one, her hair is almost platinum, it’s a very pale blonde, and done by the hairdresser, she suits it.
friend two, she is very sallow skinned, with Indian heritage, she went blonde at the beginning of the year, a cool ash blonde done by the hair dresser, to be honest it was ok. In my opinion she didn’t suit it as much as the rich brown we were used to. But she could defo get away with it.
she has however taken to using a box dye, both for time and money reasons, and I suspect doesn’t know how to deal with blonde hair, ie no purple shampoos or cool ash tones, her hair is now golden or brass coloured, and the more she dyes it herself, the yellower it gets. It doesn’t suit her skin tone now at all, and I think that’s what the op is refering to. That yellow brassy look.
i don’t think going blonde is easy , it’s certainly not as simple as chucking a cheap box dye on it every few weeks. The tone of blonde is really important to make it work.