Firstly, you need to buy atta of good quality to make the dough- ideally, chakki fresh atta that keeps the nutrients and maintains great texture. Next is to knead it for a long time until the dough is soft enough to easily pull apart and make smaller rolls for the rotis. Finally, when the roti is on the pan, let the first side cook on low heat for a minute or so and then gently turn it to the other side. Then, as that side also bubbles up, use a spatula to gently press the sides and your roti will begin to fluff up!