Wash your hair with something that lightly stains both hair scalp. Doesn’t look like you have dyed it, as there is still variation in hair colour. I haven’t done it, but my mother in law used strong tea. She would have a cup of tea in the morning and use the left over tea in the pot to wash her hair every morning. Slightly darkened her scalp and dyed her hair.
Or you could just lean into it and accept your differences