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.
It's not just gamblers and traders that monitor market price, you can also monitor market price while applying your DCA approach. Remember DCA is simply buying accumulatively at different prices. So to get the best price offer while applying your DCA strategy you still need to monitor the market, look out for nice setup that is for experienced investors who understands what controls the market technically and fundamentally.
For a complete beginner or a novice they don't need to bother themselves with all this technicalities all they just need to do is buy at every new price but they should pay attention to the direction of the market if it is consistently buying or selling to know in what direction they should buy so they don't end up buying too high when they would have gotten it much more cheaper if they have had a little patience.
I don't really get the point on why we need to monitor the market while its not actually price is not your main concern while accumulating.
We can do DCA without following the market trends since whatever price is good enough for us to accumulate. It will just bother bother people so better not to pay attention on the market and just pay more attention on your next accumulation.
Usually traders are the one who follow market trends also those people scared enough to accumulate and what they always want to buy at the dip which is actually not always possible to happen.
Consistency is really important here and we don't need any other technical things to consider before buying since we can do it anytime we want.