Any time is the best time to invest in bitcoins as price keeps on moving higher and higher and we have seen major growth in the price of bitcoin in compare to last year so if you invest today you can expect huge profits if you hold them till next year.
yes there is no doubt that we can expect in bitcoin anytime. but still i will like to say that in present time when the price of bitcoin is expected to increase more and more therefore i think it will be a good decision to invest in bitcoin right now.
It's better to take the risk than you regret it someday that you don't make a decision to buy it when the price cheaper. Like what happen to the people who know's btc back to 2013 or earlier and they not believe in btc.