From my little experience with the Bitcoin Investment system, the best time to buy the coin if you are targeting to make a profit in the bull run is during the bear run. The price is cheaper and you can make a good profit within the four-year circle. At this period you don't need to rush to buy because of FOMO but you can comfortably buy at your own pace using the DCA or other strategy that suits you.

Cryptocurrencies like Bitcoin can experience daily (or even hourly) price volatility. As with any kind of investment, volatility may cause uncertainty, fear of missing out, or fear of participating at all. When prices are fluctuating, how do you know when to buy?

In an ideal world, it’s simple: buy low, sell high. In reality, this is easier said than done, even for experts. Instead of trying to “time the market,” many investors use a strategy called dollar-cost averaging (or “DCA”)  to reduce the impact of market volatility by investing a smaller amount into an asset — like crypto, stocks, or gold — on a regular schedule

DCA might be the right choice when someone believes their investments will appreciate in the long term and experience price volatility on the way there.