I think you misunderstood something about the DCA method and the fact that DCA method is a gradual process of accumulating Bitcoin doesn't mean that it's mainly for investor with little Capital even rich investors do
Some people feels DCA is met for those who are not rich but that's not true, just like lump sum strategy are best for those who got an inheritance from there father, mother, or anyone at all or someone who had the opportunity of having a huge amount of money, DCA are met for those who receives there money week, monthly or yearly is for those who chose to accumulate with time.
So the DCA strategy is for those who receives small salary and those who receives big salary, one can decide to invest $5k weekly or $100 monthly it all depends on your Discretionary income.
There are several strategy for those who wants to invest in Bitcoin and one can only choose the one that is okay for him or her.
Actually an investor can choose more than one strategies when investing in bitcoin. Provided you know how and when to apply each strategy. So don't just think because you used one strategy to make your first buy, that you cannot utilize another strategy when you want to make another buy. You can also decide to divide your money into 3 parts, depending on how much you have as your investment capital. One part can be for lump summing, DCA, and another fraction for buying when bearish. This way you have seen that the investor has been able to make use of all the investment methods with the same amount of money. And he stands a chance of benefitting from all market conditions.