What did you mean by Investing the total investment amount at once? Anyone amount or money that is within your discretionary, even if you invest it at once there's nothing wrong the only time something will be wrong is if you used all your discretionary and went to touch money that is meant for other things, it means you are really joking with your investment especially when you don't have something that can cover up what you collected immediately. You can invest as you like, as long as it is within your discretionary but as a no coiner or low coiner you should have limitations.
I think Abaeze is misunderstanding the entire strategy of investment. I was expecting you to explain the various Bitcoin strategy because many folks believe DCA is the only successful and effective strategy. It seems they do not know why many practice that strategy. There is buying on dips, lump sum, dca and so many others. But its preferable to use DCA as a pleb so you can manage your investment and other part of you life without getting hooked. On the other hand, people who are rich use lump sum to buy. Which I will prefer if I have that kind of money.