You are right @JJG, there is no guarantee that bitcoin price will increase till infinity, even though we know that there is a high possibility for bitcoin price to keep on increasing based on past record, so that we don't end up accumulating aggressively and when the price don't turn out the way we think, we don't end up disappointed. When investing, you are to have two options is your mind which is what is bitcoin price did not reach my expectations or it reaches my expectations. This is will enable you to be careful when investing and also go on with a long term investment and steady accumulating because you know that this is the best way to make profit even though not too much should in case it doesn't turn out as you planned. The fact remains that when investing in bitcoin, don't see it as only making profit from it and don't expect too much from bitcoin because it is turn out not to be so in future, you will might get frustrated. But see it also as a store of value rather than keeping fiat in the bank convert it to bitcoin because your funds will be save from depreciating, and see it as a hedge of inflation. When you put all these in your mind when investing in bitcoin, it will give you more courage and motivation to continue accumulate regularly with DCA method.

You don't need to understand the market when you are investing in a long term investment, as long as you are you have plans to use DCA to continue to accumulate more bitcoin on a regular basis. There is no opportunity anywhere in the market to wait for, now is the opportunity to start investing because the price is still cool and you don't need to wait for any other opportunity because you might end up wasting your time waiting for what you think is the right opportunity and missout just like the example that you gave about those people waiting for bitcoin price to dip below 15k and now it is 35k. When you have started your bitcoin investment journey that is when you can then start keeping funds on reserve to buy at the dip, in case the market experiences the dip. It is good to get started now.