The more bitcoin you collect the more profit, because you can store it for a long time and this will be the DCA method. But currently if someone invested in October and his investment increased by 2 to 3 times in November then surely most success is possible with proven bitcoin long term holding.
Note that the bull market is not over yet, so even with bullish prices, if you hold Bitcoin with the DCA method, you will save on the purchase price. That's why DCA method is the best and has the most role in Bitcoin investment, so you accumulate Bitcoins little by little in which you can accumulate the maximum . And stay away from bank deposit, deposit bitcoin money.
Of course, DCA method is one of the ways of accumulating on a regular basis, yet I see no problem keeping some money in banks or however, you might be holding your fiat too, but yeah, with the passage of time, if you keep building your bitcoin holdings, then it will presumptively get larger and larger quantity of BTC contained therein, and if the BTC price goes up then overall, you would have good chance to have better returns with your BTC money as compared to having had kept such money in the bank.
You do likely have to secure your BTC in private ways, especially as they get to become larger amounts, so you have less possible issues with third party custodians. You also likely have to realize that there is no guarantee that your BTC will outperform your cash or other places you could have had invested your money, so you should be figuring out an allocation size into bitcoin that is comfortable for your balancing of your cash versus your investment into bitcoin versus your investment into anything else if you have other investments.
You are right JJG, some folks do think that as they are hodling in bitcoin that there is need for them to also accumulate cash and save it in the bank because they feel that if they don't accumulate Fiat, an emergency need might come up in the future where they will be left with the option of selling part of their bitcoin, so in order not to encounter such circumstances at a point while they're accumulating bitcoin, makes them think that if they have some cash in the bank it will enable them to use the money to sort out any emergency that would have led them to selling part of their bitcoin.
It is a wrong investment practice to be accumulating bitcoin and also accumulating Fiats as savings. Apart from keeping emergency funds that will take care of any emergency need that may arose in the future, i see no reason why a bitcoin investor will come up with the idea of accumulating bitcoin and also at same time accumulating Fiats because bitcoin gives more privacy and complete ownership over your money and has the tendency to grow with time unlike Fiats that are in the custody of a third party (banks), of which instead of your money experiencing growth, it will rather reduce as a result of some charges being deducted by the bank for either account maintenance or other needless charges in form of service fees.
Even if there is no guarantee that bitcoin will outperform cash, but having a self-custody of your money should be taking of high priority especially if you have a huge amount of money. The comfort, privacy, self-custody and the ability to make larger transactions without a limitation is the kind of freedom and privileges that any bitcoin holder enjoys as against a cash holder. There is need for a bitcoin investor to figure out a way of keeping money in Fiats and accumulating bitcoin such that his investment amount in bitcoin should not be equal with the amount he has kept in Fiats, the amount stored in bitcoins should be way higher than the amount kept in cash for emergency needs.