These are different strategies in accumulating Bitcoin. Some investors use DCA strategy, others prefer buying the DIP strategy, while some DCA and also reserves funds to also buy during the DIP and some accumulate with lump-sum (Rich folks). All these approach are decisions made individually with what suits our bitcoin investment goals.
As an investor, we have to put in consideration all of the strategies you have mentioned here, also, combining them as well is never a bad idea for those who may desire or like to have a combination for one or two strategy, but before we can start any of these approach, we have to get a means of identifying the kind of investor we are, how long we are targeting for the investment as well as how much we are investing in for that particular reason, this will help us towards achieving for the required means for the best our of interest over what we are investing, also, we can be able to position our targets on the right time and plan ahead in other to avoid having uncertainties in the way we invest, hold or sell at any particular time.
You must invest in things that you fully understand, and must keep your goal for a long time, and you must focus only on long time accumulation. Remember that you will get a higher return only when you can buy at a lower price at the time of purchase. Real investors always buy on the dip, they never think of selling on the dip, and when it increases over time, they can make huge profits. Currently the price has dropped a lot, I think it is a very good opportunity to buy. In this opportunity we should look at buying more. And can be a good startup point for beginners to start. If the newbies start investing from this point then they will get some good returns when Bitcoin goes above 120K.
So make a sound plan to sustain yourself for a long time and start from any good startup point (whichever feels good to you). And don't panic after investing and start holding for a long time, you will see that at some point you have got a very good return.