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You don't need to have thousands of dollars before you can start bitcoin investment, that's why we have the DCA. Good a thing that bitcoin can be bought at any fraction, depending on the money available. Yes you are right about nobody knows when the price of bitcoin will be low. But that's why it's always advisable to make plans ahead of time, by keeping a certain percentage of your investment funds for buying the dip, should in case the dip happens, so you won't be caught off guard. When bitcoin is high we don't save money and wait for it to low before buying, we buy through DCA when you think that bitcoin price is high. This is why we have the DCA. Nobody knows when it will low. Saving the money is not advisable as you might miss out buying. When it's low buy the dip, when it's high buy with DCA.
Building an investment portfolio with the DCA strategy sounds easy and very easy to understand. You only need to have a budget and set aside some for DCA, then you can buy at any price (real time price) without hesitation. However, in practice, not everyone has the same courage to act. Look at how many of them don't dare to buy when Bitcoin experiences a correction, they seem afraid that the price will fall even further, causing them to suffer losses.
Maybe, they don't understand the strategy and understand how the strategy works. Accumulating assets with the DCA strategy is a better way based on my personal experience, it is clearly profitable because it is likely that the amount of assets you accumulate will be more than a lump sum. For long-term goals, an accumulation strategy with DCA is the recommended one. Not only for bitcoin, even if you want to invest in real assets (for example gold) this strategy also works.