Which shampoo and conditioner

[scater]

So I've had my hair brunette for ages and always used a colour maintaining professional shampoo and conditioner.
Slowly going lighter now and had thin highlights with a caramel toner over.
What do I use now? Purple, blue?
Thanks.

I like the L'Oréal colour protection range

The bottles are all red

Maybe once a month do a blue or purple mask like Fanola for a toning treat ?