Low porosity hair girlies, what's your minimalistic hair care routine?

I have really thick, long, dark hair, and I struggle with flakes and itchiness. It also just feels unhealthy in a way. I'm thinking of using a purifying shampoo occasionally and a gentle baby shampoo for regular washes, plus a lightweight oil.

I used to follow a long, complicated routine, but it took a toll on me physically and mentally, so I really want to keep things minimal. What do you think?