For me I think it could still be profitable to invest to Bitcoin but the risk is high at the moment. Well it still up to you if you could manage to take profit that's good and if not well I hope it's a lesson that you should only invest when the price is low.
Best time to buy BTC was during the dips, but since investors are usually scared when prices go down, since nobody knows the bottom, investing at dips is really not an option for many. Presently I'm holding the planned amount of BTC I hoped to, but if I want to buy more BTC, let's say with 10,000$, I will divide the funds into four (2500$ each portion) and invest at intervals. This will enable me to be in profit if prices go up or buy the dips if prices go down to even up.