There is no other way to make a profit in bitcoin is by long-term investment, making purchases with DCA and when you feel you have enough bitcoin that you already have then store it in a wallet that you control yourself and after that it's just a matter of waiting until the time comes that you want to harvest the long-term investment profits that you planned.
Bitcoin is never enough if you want to keep it for a long time. You have to keep accumulating it so that you will not rely on what you have already accumulated because embarking on a long-term investment is not as easy as we usually say it; it deals with a higher level of patience that we will never expect. So we purchase bitcoin with DCA, and continuously you will always feel like you don’t have enough of bitcoin. That will help you not to rely on your already accumulated bitcoin, and it will help a long way to hold your bitcoin for a long time to have a better profit.
if you've already set out an emergency funds and you don't become lazy with your primary stream of income just because you have some Bitcoin stack already, you wouldn't for any reason think of using a part of your Bitcoin holding for a personal gain.
The reason why you're stacking Bitcoin with the use of the DCA methord is so while you're buying your Bitcoin, you can still have some good amount of spare cash you will be left with to sort out your needs throughout your accumilation phase. For those that are in for the long term, it's obvious you will have to pass through series of phases when you get tempted to seel before you've reached your accumilation goal or you see certain things along the way that gets your attention and you're compelled to use part of your holding for those purpose. It's through the right plans you've set out that you can comfortably overcome these challenges and continue doing DCA till you've reached your goal.
Purchasing Bitcoin for the long run is not easy at all and certainly, there will come a time when you might not follow up your routine the way you've planned it out. That's just life and it's totally not an ideal setting where everything you've planned just works out the way you've planned it but in the midst of this reality, you still have to strive to remain consistent at your accumilation plan and discipline yourself never to be extravagant with your Bitcoin stack.
I find this choice of your word problematic which is subjecting the money that is meant to take care of your living expenses to be spare amount or cash you will be left with to sort out your needs, you might be right in your explanation but your choice of words can become contradictory to a newbie, my point is that it is best we prioritize the amount of money to be used to take care of our living expenses by not relating it to called left over cash, or spare money, whereas what should be considered as a left over cash or spare money should be be associated with our dca amount.