A person is most likely to benefit the most if they invest in Bitcoin initially and keep it for a long time. The investor will be able to sustain his investment for a long time by diversifying little by little, which is why the DCA method is most important for both every holder and every investor.
I don't understand what you mean by diversify little by little, because from what I understand about the word diversify, it means to stop your bitcoin investment and put the funds that you are using to invest in bitcoin into another asset like stock, bond, gold or real estate.
You are wrong, diversification does not mean you should quite the one you are doing at the moment, diversification means as you are already investing on one side or Bitcoin and you want an assets that would be on different side, for instance you are investing on Bitcoin currently and you decide to also open a business you would be running on daily basis that is also called diversification. Sometimes when people hear the word diversification they mostly don't see it as having different things because what they understand it to be only one. However if perhaps diversification is one investment what then do we call two different investment owners?.