The downfall on its market value is resulted from China banning Bitcoin exchanges and ICOs since China is one of Bitcoin's major investors so losing it is not surprising to negatively affect Bitcoin. But as of now, Bitcoin is slowly recovering and is now priced at 4200. It is expected to reach the 5k mark without China especially if the next hardfork will be as successful or more than the previous one which made Bitcoin to reach 4000 in just a short period of time from 2800.