The fluctuating nature of Bitcoin is what we call the volatility which traders always play around with and investors are not concerned with the behavior of Bitcoin I mean whether uptrend or downtrend investor doesn't care. what investor care about is how to accumulate enough Bitcoin within the shortest interval of time and the DCA help us to invest anytime, increase in price doesn't affect or doesn't make the DCA not to function. Targeting or watching the market is not a bad idea because some people watch to see if there's a good entry point and investors who does this are the lump sum and buy Dip investors but it will be a wrong idea to be watching your investment after investing because if you're not disciplined enough you can be tempted to touch your investment when you're not suppose to.
Every coin in the crypto market is subject to price volatility. Sometimes we see that the price of some coin has increased and sometimes we see that the price of some coin has decreased, that is, the market constantly goes up and down, which we always observe in the market. Every investor wants to grow their invested bitcoins, but as you mentioned, to accumulate enough bitcoins in a short period of time. This is not possible if you invest using DCA because in this method you will be buying bitcoins in small amounts regardless of your income and expenditure whether on a weekly or monthly basis. As a result you have to patiently spend a long time to own enough bitcoins.