You have to make some bends.
The most important step is bending the tail a little up.
You can also bend it slightly into a V shape.
Next, bend the wings a little bit upward.
Beyond that, adjust the middle small wings by bending them up or down. Or just leave them as they are.
Good throwing technique is also important. Throw it like paper airplane.
Be prepared that not every flight will be good. But if you train the dragon it will fly smoothly.