When it comes to Bitcoin investment there is nothing like been late and anyone who is using that terminology is either deceiving himself or herself or not serious to invest because someone who is actually interested won't look at been late or not since they will consider the DCA method and holding for a long period of time. Again, it is not even about starting early because there is a possibility that someone who start investing now can grow his or her portfolio more than someone who started some years before them depending on their capacity, it is only a wise and serious investor will understand this.
What you're saying is clear: every investor can develop their own portfolio according to their financial capabilities. Even if an investor regularly buys Bitcoin for investment purposes, even if they're not a long-time investor, they can still reach the level of established investors. Because in investing, it's not about who started earlier or later, but rather who consistently makes purchases over time to increase the amount of Bitcoin in their respective portfolios. And I also agree with what you said, that a very wise investor in investing is an investor who never wastes an opportunity to continue doing it routinely with the funds he has without being affected by the conditions of the increase or decrease in the price of Bitcoin itself.