I think your strategy is still to buy low and sell high and DCA, and it's not really safe. keeping the coins stable can help you react quickly to market changes, but I see you don't mention placing stoploss, which is a big risk.
indeed the strategy used like that but you should know that to determine the position of low prices and a good position to sell is very difficult to occur because basically the price movement of cryptocurrency is difficult to predict, so for the easier you might apply according to what you say and implement long-term trading, wait until your sell order is sold.