Maybe they should eliminate those thinking upon save up then buy a whole Bitcoin. Since if they used the money they have to accumulate right away then do DCA, there's more better chance for them to earn possible huge profit from Bitcoin.
It is important that they buy bitcoin not just with the money they have since some part of the money might still be for their expenses. More emphasis is on purchasing bitcoin with their discretionary income, so the investor has to look into his finances, know how much discretionary income would be available and be able to carve out a good percentage of it to continue investing into bitcoin to maintain aggressiveness without overdoing it.
Investors should identify their discretionary income, use it to buy bitcoin for the start and follow up with DCA. Having set their accumulation target and holding period, they should follow up buying consistently and with dedication. There is also need to be building out their backup funds alongside accumulating bitcoin to prevent their portfolio from being tampered.
Another thing you've to know is that when a potential investor has not started buying bitcoin, he has not started. The thought of saving to buy bitcoin is only a hypothetical investment activity. Until you have bought bitcoin and had laid out plans to continue and sustain your investment, you are just a spectator and might end up not actually investing.