Even if you disregard the bad animation and art, even the text is badly done, the music abruptly ends in the middle of a bar, the pacing is weird, the trailers are too short and you're using images with backgrounds that should be the size of the video, but are actually smaller. So, no, I don't think you could do what I can.
I recommend actually becoming good at what you're trying to do before offering your services to others. If you did a trailer for one of my games, I'd be worried that it would negatively affect the perception people would have of my own work and judgement.