Elon Musk may play a very huge role when it comes to bitcoin's price. However, the fact of the matter remains that he is not the only one who could have influence over bitcoin. The fact remains that Elon has invested a good sum of money in Bitcoin. He could have had used his influence, but it seems that his influence is quite limited to some extent.
In May 2021, there was about 53% fall in Bitcoin price with the coin crashing hard from $67k+. This 53% fall in Bitcoin price was attributed to two things. The first one was Elon Musk going back on his promise of accepting Bitcoin as payment in his Telsa company and selling his $1.5 billion worth of Bitcoin. Secondly, China announced another cryptocurrency crackdown and this saw more than $1 trillion in value of BTC wipped off the global cryptocurrency market in just 1 week.