Waiting to buy Bitcoin at the dip is not a good decision for anyone that want to make good investment in Bitcoin because it's not certain that the price will reduce to the minimum expected value that you targeting before you will buy and this can make someone to loose a good opportunity buying Bitcoin at a good rate if you consider DCA.
I think buying Bitcoin by DCA is more preferable to waiting to buy in dip because with DCA you can be monitoring the price and still be investing on a particulate rate over the time and even if the price happen to appreciate instead of dipping as you are expecting you are already in business that will give you a good return which you can add up with the valuable capital to buy more Bitcoin by DCA.
There is absolutely no need worrying your self by always cheeking or monitoring the price of bitcoin when you are already using the DCA strategy for it is gamblers or traders that always monitor bitcoin price so they could sell out if the price is dropping meanwhile the DCA strategy gives you the room to invest at a regular interval by gradually accumulating more bitcoin either every weeks or months weather the price is high or not and continue hodling for long, so always monitoring the price of bitcoin before accumulating Bitcoin is not for DCA users for it is traders or gamblers that always monitor bitcoin price before accumulating Bitcoin.
So far as one have the habit of monitoring and checking the price of bitcoin it means volatility is still a threat. It is only in trading a trader is expected to monitor the market. Bitcoin investment is a longterm investment and you don't have anything to do by monitoring the market, fine if the price of bitcoin goes dip it is just a chance for you to buy more bitcoin and you do not monitor the market to know when to buy bitcoin. As an investors you buy bitcoin at all time you know you afford it and not only in the dip.
The price has nothing to do with hodling and investing bitcoin, if you are considering bitcoin in your hodling it can be a distraction to you and means you still don't have the understanding of bitcoin.