Switch bath soap.. We use Dove Baby Wash and luckily avoided cradle.. Dove is extremely limited ingredients and even pediatrician was surprised we didn't deal with cradle
I finally bought mustella cradle cap shampoo and it helps especially if you massage it before and after because it softens the flakes a lot
The only thing that worked for my toddler was rubbing coconut oil in her hair about 30 minutes before bath, washing it out and then combing her hair after. Took a few days of doing this