You plan to buy bitcoins in bear markets and sell bitcoins in bull markets, but you may not always benefit from such plans. Maybe when you buy bitcoins, the price may drop further than that. When you sell Bitcoin, the price may go up even more after you sell. Then you will regret it. So I think the best strategy to invest in Bitcoin is to invest in the DCA method and hold for a long time. If you invest in DCA method you can buy bitcoins at average price.

DCA is one strategy that might be considered so that he can take long-term investment steps as an effort to get maximum profit, while waiting for a decline as a step to buy in large quantities can be considered using other capital.
Buying in a big increase is not really a problem as long as he can store bitcoin in the long term, but it will affect the condition of people who do not have stable finances so that when they need money and sell in a decline will make them suffer losses.

Every strategy must be seen based on a person's ability to on the travel, but doing DCA is a much more appropriate choice for someone to apply because in this way people can slowly increase the amount of bitcoin ownership.