To know the real value of bitcoin needs more time. 
You do not need to invest in a hurry, maybe a bit will return $ 7 - $ 8k a time in February this year! 
time to buy 
You are right but no one can tell whether it will go up or down in the coming days, there are chances that the market price will go up as price of bitcoin is recovering slowly. So if you have made up your mind of investing some money into bitcoin, then there is no point of waiting for something like decrease in the market value of bitcoin. Invest right now and hold your bitcoins in the future for better future. You do not need to invest in a hurry, maybe a bit will return $ 7 - $ 8k a time in February this year! time to buy