Bitcoin has it's lowest price of all time, this is the right time to buy bitcoin because bitcoin market is down and in the end of 2018 bitcoin will touch 20k$ above again....!!
For me the opportunity in investing Bitcoin in some project of ICO but make sure to research all of the information you need to make sure that the project you want to participate is legit, and you can also buy bitcoin while it is in lower price because it can give you a profit if the price of bitckoin suddenly increase.