Buy in is my opinion and suggestion to other users, this is what i did few hours ago, now i am seeing some of altcoin and bitcoin was already increasing its value and i am happy with the result of my decision.
This moment is not late to invest, buy bitcoin now until the value are not yet reaching 12000 dollars.
Of course, there is a downward trend. But while I remain calm, I will start to worry when the price of Bitcoin goes below 10,000 dollars.