Best time to buy was 8 years ago 
Next best time is now, dollar costing average is the safest way, but definitely don't just wait for the "perfect" time, because that will never come
Very true it was the best time to buy bitcoin so some people who are just like me are regret to lose the chance for having bitcoin at that time, right now bitcoin is the best currency and it will give you profit if you buy right now and dont wait any more for the price to be high, most of people use to buy at high but according to me it is the foolish decision to buy high and sell low,. So better to buy right now and dont wait any more, today it is really affording and later on it will e expensive. Next best time is now, dollar costing average is the safest way, but definitely don't just wait for the "perfect" time, because that will never come