Long-term investment is not by buying and holding dips, you have to save regularly then it will be parfect investment, for you especially for Bitcoin investment. If you consider risk, it will be in the investment from any side and Bitcoin investment can be considered as a quantitative reduction from it.
It cannot be a statement that long -term investment is not through purchasing and holding. I believe that the prerequisite for investment is saving, i mean creating a source of income. If we can gather what we need before investing, then we can become investors by buying and holding for the long term. Moreover if you initially think that long-term investing does not involve these issues, then you are still living in a bit of a dilemma.
The loss aspect of Bitcoin depends on your investment strategy, for example,
It is true that Investment strategies can never cause losses from Bitcoin but rather on the lack of timely decisions and the fact that the investment was made for a short term. Everyone know investment strategies can always be different but I think all strategies have one thing in common: they have to last a cycle or two because we historically see Bitcoin revealing its new price in every cycle. To my knowledge bitcoin has completely made history in this 2024 cycle.

You might be correct about bitcoin making history, especially since each halvening has some differences from previous halvenings.. including that the 2024 halvening had an ATH that came before the halvening, and then sure we also got some new all time high after the halvening too that started to be pumped between the November 5 USA presidential election and the January 20 inaugeration... at least so far.
Another thing is that your included chart is also outdated, and even though the Cointelegraph article that cites such chart was updated in December 2024, it still left the chart as if the price 150 days after the 2024 halvening was still unknown, when it was not.
There have been about 343 days since the April 20, 2024 halvening, and September 17, 2024 would have had been 150 days after that halvening... and the
BTC price on September 17 was in the ballpark of $58,211.
I highlighted the old chart to explain that person as an example, so that he clearly realized that Bitcoin in each cycle touched its new value. I also mentioned earlier that Bitcoin historically touched its new price in each cycle and even made a new history in 2025. We have seen the fourth Bitcoin Halbing in the history of Bitcoin, in April 2024, we have spent a long 11 months in which Bitcoin has reached a more unique height. Moreover, the chart mentioned in me proves that the price of Bitcoin started to rise from the beginning of 2024, that is, Bitcoin began to show its new form before the halbing began. From then on, the price of Bitcoin increased and made a unique history on the 5th of December.