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.