If you want to become a professional car tester for an international audience, one thing that could help make your videos more professional would be taking lessons with a voice coach, like actors and people in the mass-media do, to acquire the same accent as people on CNN for example, and also a smoother flow, and more confidence. Most of your fans probably will not tell you out of kindness, but the truth is if you work on it, your voice could be more pleasant. Until now it had its charm because you are an enthusiastic amateur, and it is nice discovering people from all over the world on youtube, but if your ambition is to be a professional, this is something you should do. Also, a professional microphone like on TV would help, especially since talking inside a car is not a really pleasant experience with all the unpleasant noise sources when driving, and the poor acoustics. Unconsciously, sound plays a big part in how much people are immersed in a movie, that is why movie theaters spend insane amounts of money on sound equipment. Amateur videos, even with 4K cameras, are immediately noticeable on youtube because the sound is of poor quality. Maybe you should also add light sources inside your Model X, because when you film yourself at night in the MF, the image is of poor quality, too grainy. It will be a much more common occurrence up North.
Waiting impatiently for your first Model X video ! Cheers !