1. Move the camera so it does not film from underneath your hands but rather gets an angle from above. This will put your flourishes in a better light.
2. Get this from the beginning and you can become a god very fast. If you do not have speed yet because you haven't put in the required hours of practice, then go for the flow, for the smooth performance, for the slow execution. Doing it slowly will allow you to think of the movement of the cards rather than executing them perfectly. If you have flow you can get away with a lot.
3. Who is it that you learn from? Who are the people you look at and get inspired from?