What I understand from @Popkon6 statement is that DCA help anyone wants to save BTC consistently according to the specified target. And this DCA strategy means that an investor will only make purchases every week or month with the same amount and does not care what the price as long as it has not reached the target. So, there is no influence on the impact of market downturn.
It is not necessary to invest with the same amount of money. It is okay to buy consistently every week or month in the DCA strategy, but there is no obligation for you to buy the same amount. You can increase the investment amount in any month/week if you want or reduce it if necessary. It completely depends on your ability. Investing in the DCA strategy means that you will invest continuously in any amount for a certain period of time depending on your ability and hold it for a long time.
Do you really understand the DCA strategy?
How it possible to use DCA strategy with different amounts every week or month? It seems to violate the pure rules of DCA strategy.

I may understand your statement regarding investing with different amounts. Because there may be an investor who does not have a stable income. But with different amounts you will have difficulty in calculating the all amount profitability your investment. While the DCA strategy helps us more easily calculate the amount our investment without looking at our assets.
As JayJuanGee often does when calculating the total investment using the DCA strategy using
DCA calculator. Then how do you calculate your investment when using the DCA strategy with different amounts?
In terms of the amount of money, if you have the ability to invest the same amount every week/month, then you can definitely invest without making any change in the amount. But if you have difficulty in maintaining the same amount of investment or you are unable to do so, then it is not necessary for you to maintain the investment amount. Invest as much as you can from the remaining money after meeting your daily needs. There is no problem in increasing or decreasing the amount of money as needed. However, I would advise you not to reduce your investment amount unnecessarily and not to invest more than you can afford. Invest in an amount that you feel comfortable with
If you see my previous reply, I once said that if anyone is interested in investing in bitcoin using that strategy, they should really think about strong consistency to buy the same amount and use the amount that they can afford to lose. Even using $5-$10 is not a problem as long as they are consistent. Because, by being consistent they are able to calculate all their assets more easily.
Even if you have a larger amount to invest, it is not necessary. We just have to stick to the commitment and be consistent which will not make it difficult for us to implement the strategy.
What Shadiq said is correct, and what len101 is mostly correct. I have fixed amount I budget for dca but sometimes stuff comes in real life, some good some bad. I had an unexpected windfall two years so I increased my DCA amount temporarily over a 3months period(I could have else lump summed too but decided on dca). Alternatively something bad could come up where maybe you have no other choice but to reduce your dca temporarily(consider it was bad enough to reduce your liquid emergency fund, so now you need to go look for liquid in other place like your investment outflows to start rebuilding your emergency fund) There is no hard and fast rule about using the same amount but you should have some written rules in place for yourself for unforeseen events good and bad when they come up. Ideally you only want to trigger these in extreme cases specifically any reduction.