So you are basically talking about DCA right? It's a great way to keep your assets at the same value despite the market condition. I like it, but instead of also buying in the uptrend, you can wait for the market to go down again and buy at low price. And HODLing is a great way of investment for future. But if you are willing to make profit in the present, you have to take the right decision of not always buying. Sell at high, buy at low. I think this should be the strategy.
The idea behind DCA is to buy bitcoin at regular intervals regardless of the price at the time, if an investor begins to worry about it and prefers to wait until there is a downtrend to buy it then it is better for them to become traders instead.
As a matter of fact this is what makes DCA difficult to implement, this is a strategy that would be very easy for a bot to implement, but for a human this is difficult as there is always a natural desire for things to go our way, and this makes buying during an uptrend difficult as we cannot stop thinking about the recent past when we could buy bitcoin for a lower price and wish we could buy even more bitcoin at that price.