Yes you are right friend, but in my opinion it is not only the DCA technique that will make long-term investors in bitcoin potentially profitable, but other buying methods I think will be equally profitable if hodl in the long run.
DCA method has absolutely nothing to do with your future profit, is just a strategy meant for bitcoin accumulation this strategy is mostly used by those new Investors and also those that can't afford to buy in lump. Moreover some people feel that doing the DCA is less stress than buying in lump since DCA gives them the opportunity to buy with any amount, The only different between this two method is that a guy who is buying in lump is always faster than the DCA Guy that's depending on your weekly purchase, but that doesn't mean that a guy who is buying in lump sum will be more profitable than the DCA Guy. Moreover your investment goal May be different from the guy that is buying in lump.
Bitcoin never guarantees profit in any strategy, market fluctuations are always unpredictable, we have seen that Bitcoin fluctuates in the short term but in the long term it brings success to people, and this is why we should always invest for the long term, although we can never be sure of this, but since Bitcoin has always grown in the long term in the past, similarly we believe that Bitcoin will always continue to grow in the long term in the future, and because of this belief we should always invest for the long term. Now everyone may have a different mindset when it comes to investing, some may prefer aggressive investing, while others prefer consistent investing, now when it comes to investing, DCA is the best option, it always offers the best benefits, as investing through this strategy alone can completely avoid market volatility, which accumulates holdings at an average price, so the main thing here is your mindset, which strategy you choose should be determined according to your investment style, if you are thinking of holding bitcoin for the long term, then DCA is definitely the best for investment.