You really don't need an expert to tell you what really happened, you have big investors like Elon Musk and his companies investing billions of dollars into bitcoin, and that created so much hype and excitement in the community that made so many people invest more and that drove then price up, and than he suddenly drops out because of environmental problems caused by mining, and china actually taking serious measures against bitcoin miners and the panic that all of that caused so many people to sell that drove the price down.