The DCA method is the best for every Bitcoin investor, I would like to add something to the information you have given. Because if Bitcoin can be invested according to the DCA method, then it is definitely possible to be successful and it will be possible to hold Bitcoin for a long time.
You can buy bitcoins several times and think like you are doing Dollar Cost Averaging for your Bitcoin investment portfolio as well as believe that you will be able to hold your bitcoin a long time.
It can work or can not work, and it depends on how did you manage your finance including investment capital. If you use all money you have for investment, and you always have empty pocket after each bitcoin purchase, you will have very weak financial status and balance so that it's harder for you to hold your bitcoin. if you need money for spending, you will have to sell part of your bitcoins.
The scenario you’re trying to portray here is very unlikely to me cos I don’t see any reason why one would want to put all his money into an investment even if it’s bitcoin and after it you’re left with empty pockets, how then will one survive and cater for his needs, this is not an investment, this is FOOLISHNESS of the highest order and shouldn’t be adviced or encouraged or even talked about. It’s only amongst highly addicted gamblers you hear such stories where they can even sell properties to gamble and lose it and be left empty and swimming in debts and loans.
Again Buying bitcoin severally isn’t just what makes it a Dollar Cost Average Strategy. It has to be planned strategically and at a desired interval with purchases made from discretionary money with a specific amount in most cases and at the end the total price made is satisfactory and not being affected by market timing.
Someone who buys today and tomorrow buys again with different values and after like 3 days buys again and continuous to buy at random and with different dollar values, I don’t think he’s DCAing he’s just buying at random.