You can invest right now why? Because the value of  bitcoin is coming back you need to patiently wait until it reaches again the highest possible value. Better that you will invest now and harvest a lot in the future it is very good tactics to  earn a lot of profit. Ofcourse in this kind of business it always have rise and downfall but for you to overcome that and if you want to survive you need to face it and embrace it wholeheartedly that's what being investor is. Invest now and earn a lot later!