But for this we must maintain our investment for a long time as long as possible as a long-term investment. The main purpose of Bitcoin investment is to maintain it for a long time according to the DCA method, if you do not follow the DCA method then you will not be able to maintain your investment.
DCA method does not guarantee the sustainability of our investment for a long time. DCA method is only a strategy of accumulating Bitcoin consistently and periodically using a slow and steady process across a longer period of time in order to achieve a decent size portfolio for yourself. Although an investor that is committed to increasing his portfolio consistently with DCA is less likely to be distracted or give in to the temptation of selling on a short-term.
Maintaining your portfolio untampered for a long time has to do with your discipline, determination and accurate cashflow management and your dedication to setting up backup funds to protect your investment from tampering.
DCA method is just one strategy, other investors can choose to lump sum and still hold for a long-term. I think if you have a holding period and an accumulation target in mind, with focus, commitment and determination to achieve them, you'll be able to hold for a long-term.