This year the price of bitcoin has dropped for a long time, and don't know how long bitcoin will be like this. I think this is a year of challenge from bitcoin, those who are strong will stay here and the weak will leave, this will be an option to determine the future.
As of now the price of bitcoin is start to recover again and I think this moment the price will spike to the moon. The down trend of market is the biggest challenge in this year 2018. You need to be strong to overcome this challenge and never give up in bitcoin.