It's not the first time that BTC is in a bear market with a 60% - 70% value loss. If you check bitcoin history, you will see that the same scenario happened before, a few times but bitcoin price always recovered. It will be a great opportunities for us to invest in bitcoin today. If you see bitcoin as long term investment and don't mind to wait a few years for concrete profit, than just buy more. I expect a bounce back at the end of the year.