that is the time when price is at the lowest (with the exception of weird unexpected stuff like bitfinex hack and the drop).
The Bitfinex hack overreaction was another buying opportunity.

You only registered in 2016. It is quite easy to make money while bull trend lasts.
If you abided by your own advice during bear market, that is in 2013-15, you would go bankrupt. I should know, I did go bankrupt at that time.