No one knows if it is the best time to buy BTC, because no one knows where BTC can fall!
Now I can only believe that BTC will continue to rise to a new height in the future!
Hey while it's difficult to predict where the prices will end, I believe bitcoins prices have fallen really low and it's a good time to accumulate them at every dips. I believe we should be seeing upswing in bitcoins prices in the quarter 1 of 2019, as the launch of Bakkt and Nasdaq Bitcoins futures is confirmed. Also if sec were to approve bitcoins etfs on 27th February 2019, we shall definitely witness a bull rally hence i feel it's good time to add bitcoins to your portfolio at current levels.