If what you're looking is to trade there is not a wrong moment to do it, traders concentrate themselves on shorter time frames so they are unaffected by the long term trends of bitcoin and any other cryptocurrency, the only thing that you need to ask yourself is if you are ready to trade, did you devise a winning strategy? Have you tested that strategy? Do you have the knowledge about what kind of risk are you going to incorporate on each trade? If you have answers to those questions then you can trade.