With the recent rise in the price of bitcoin to us dollars to as high as $3305 as at yesterday, the best period to trade your bitcoin is now.
if by "trade" you mean sell because it is a big number in your eyes then no, it is not the best time to sell because bitcoin has just started moving up. and will continue as the BIP141 locks in SegWit and then the follow up rally will be as SegWit activates and we see it in real action. this is actually a long awaited rally.
but if you mean trading in the normal sense then there is nothing different. you could have traded bitcoin (bought and sold and bought back) the same as before and in the future!
The original poster must have been confused a little. It is indeed not the best time to convert Bitcoin to cash as the value is rising and can continue to rise in days ahead though there might be some periodic corrections but holding on to what you have can be the best strategy. In fact, there are now many who returned to Bitcoin after they listened to FUD and converted their Bitcoin to fiat. That was a a big mistake.
However, if the original poster is a good trader then he can make good money whether the market is going up or going down. Volatility can be a friend to someone who knows what he is doing. According to many analysts, there is a big chance for Bitcoin to breach the 4K wall before the year ends...though we have to be careful as not all predictions can come true.