When it comes to bitcoin investment there are things that are important to have and one of them are reserved funds, like you said it helps one when there's a dip, when you are using the DCA strategy and you have also built a very good reserved funds it will help you accumulate more Bitcoin than someone who is just using the DCA strategy without any built reserve funds.
Dollar Cost Averaging method invests as much as you can afford i.e. you can start with a small amount even if you don't have a huge amount of cash. Investing does not mean investing all the money you have. One thing is true that we need a certain source of income or funds before investing. Whenever you have a fixed source of income in terms of investment, you can continue your investment comfortably with the reserve money to meet your needs with the money earned from it. Moreover, reserved funds play an important role in investment. Because if you have enough funds for investment then no matter what happens in the market you will be able to keep your investment active by buying bitcoins regularly.