You are not saying this very well laijsica, and there are some ways that you may be leaving some bad impressions in the way that you are saying what you are saying.. since it sounds like you are wanting the hesitant person to convert over from investing and into gambling in his waiting for lower prices and also holding back value so that he can invest at lower prices which seems to reinforce a kind of gambling, rather than investing mindset.   

It is also problematic when you suggest that there is an "ONLY" solution, even though there are likely preferable solutions, which relate to just getting started as you seem to be suggesting and starting DCA, which you also seem to be suggesting, and so nothing really wrong with that aspect of what you are suggesting. 

It is unclear about why you are proclaiming that it is good to start with large amounts rather than the more individually tailored approach would be for the hesitant person to start with small amounts while getting used to the idea and just putting systems in place and not necessarily committing to bitcoin in BIG ways, since such person is not seeming to want to get started in bitcoin and might well be concerned that the BTC price is going to crash. 

With regular newbie investors into bitcoin, there would really be no need to hold back any value for buying dips, yet sure if someone might already be scared and hesitant, then in those kinds of cases, those kinds of people could invest way smaller amounts in the DCA to just get off zero and to just put their systems in place without committing very much to bitcoin, and at the same time, such persons could hold back some extra cash which could optionally be used for buying bitcoin on dips.. or just using that money for other purposes if they continue to be afraid of getting further involved in bitcoin beyond the DCA and beyond whatever studying that they might be doing while they are continuing to ongoingly DCA.. even with just relatively small amounts. 

Buying on dips and saving large amounts of value to potentially invest into BTC on dips is not necessarily a good strategy for most regular people to really get involved in investing into bitcoin, yet if we are already presuming that the person has a lot of hesitancies then such a strategy could work for such hesitant person, even if it is not really generally a recommended strategy, that kind of a strategy might work for that particular hesitant kind of a person just while they are still getting used to the idea of bitcoin and while they are continuing to study bitcoin and get used to better attempting to understand what bitcoin is.