Don't know if this example helps but it's a case of whether he or she is an angel investor who's putting in their own funds with the expectations of making profits by taking advantage of the market, he can use the DCA approach OR if the investor is a venture capitalist who's investing more money into the coin, then the investor will want to wait for the Lump Sum to make profits.
Lump sum can be bought anytime and there is no special time to lump sum, as long that you have the money since you will be investing in a long term investment. Lump sum is for the rich who don't have time to monitor the price movement of bitcoin or they are too busy with other investments. They can lump sum no matter the price of bitcoin at that moment. Example is MicroStrategy that buys huge amount of bitcoin without considering the price of bitcoin.
If you are talking about lump sum buying at the dip, then it is fine when you have prepared for that bit don't stop accumulating and keep waiting for the dip because the dip might not come when you expect it because bitcoin price moves in any direction and very hard to predict which price it will fall on in the next minutes. This is why it is only the DCA strategy that is recommended for newbies to stick to while the other two strategy can be use when the opportunity comes to apply them. This is because your focus on to reach your bitcoin target within a timeline.
Sometimes it seems to me that it is much easier for a beginner to make money on Bitcoin than for those who have been involved in cryptocurrency and Bitcoin for several years. Even I remember myself, at the beginning of my journey I just bought Bitcoin and did nothing else, because I was afraid of making a mistake due to the fact that I had little knowledge. The bull market began and the Bitcoin that I was holding rushed up. But the main mistake here is that I didn't take profit and then the bear market began. I'm talking about this because I was close to a great result, but I didn't take one right step. Some beginners can also buy and hold Bitcoin, at the moment when it grows to the skies, lock in at least part of it and become more successful. In any case, in words it looks simple, but in reality it is quite difficult to do this.
As a new investor it is not that easy to invest in Bitcoin first because you cannot choose which coin will be good for you to invest or which coin will be safe for your money at the beginning.
While it is difficult for everyone to invest in Bitcoin in the beginning, it was easy for me because I didn't learn about crypto currency first but I learned about Bitcoin first. Ever since I first came to know about Bitcoin, I have had a distinct fascination with Bitcoin, and the thought of when I can invest in Bitcoin has always been on my mind. At that time I developed a strong desire to know something about Bitcoin and I tried to find out. Choosing Bitcoin for initial investment was not a difficult task for me as I tried to learn enough about Bitcoin.
Any newbie that knows how to save money and understand bitcoin investment should be on a long term, will find it easy to get started and continue with regular DCA because he already know the important of saving money and have done it before. Why @sompitonov made that statement is because in the really stage of bitcoin. investors hasn't know the potential of bitcoin and how the price can skyrocket within a short time and anyone investing then is like taking a big risk but just because he believes in bitcoin and decided to give a try. Unlike now that bitcoin news is everywhere that it is very profitable to the extend that some people even think that it is a quick profit scheme. You were lucky that the time you bought your first bitcoin within a short time, you made profit and like you said, this was what motivated you to carry on with your investment. I guess that assuming bitcoin went below your entry point, you might have panic and sell off.