You are absolutely right, any investor who wants a huge return must or should accumulate Bitcoin and hold for a long period of time unless they don't want a huge return and then, they can go ahead with the short term investment and whether short or long term there is going to be a return but there will be difference in the return.
Investing doesn't mean you'll get rich quick. Moreover, Bitcoin investment should not be thought of as a get-rich-quick scheme because crypto is volatile. But in Bitcoin investment it is certain that you will get success if you hold the investment for a long time. However, those who invest in Bitcoin in the short term or plan to invest in Bitcoin in the short term may not be investors but mainly traders. Investing is always long term and trading is short term. Long-term investment in Bitcoin has a high probability of success because if one holds the Bitcoin investment for at least four years, there is a high probability of success when the halving is organized after four years and then the price of Bitcoin becomes bullish.
However, investing aggressively in Bitcoin can be disastrous at times that is if an investor doesn't have a good discretionary income but when an investor have a good discretionary income investing aggressively will be a nice move as that will help them increase their portfolio faster.
That is why it is most important to create a fixed source of income before investing. When an investor's financial management is well-organized, his investment continues smoothly, that is, he will be able to continue his investment without any obstacles. Are you suggesting aggressive investing here to buy large amounts of bitcoins at once? If that's the case then maybe you're wrong, because if you have a source of income why would you buy a large amount of bitcoins at once which might be risky for you.