Same here! I have very thin hair I used to wash it everyday because it would get super oily and flat. When quarantine happened I decided to give no poo a try. And it worked! My hair has much more volume. I have been doing mostly water only and a bentonite clay mask every two or three months. A few weeks ago I burned my hair using a grill and I did the mistake to use baking soda to wash and try to remove the smell. At first I was like oh my hair looks great it’s super soft like if I used shampoo. And yes it was like if I used shampoo, it removed all my natural oils that were making my hair so nice with volume. My hair was flat and oily again, it took more than 3 weeks to go back to normal.