In my own case, I would consider DCA with discretionary funds as the most secure long-term course of action, whereas I would consider dips as an opportunity to be a little more aggressive provided that your financial capabilities permit it. In that manner you would develop progressively without putting aside money that you could require the next day.
Don't rely on the market to be aggressive in investing. Rather, you can be aggressive in investing as soon as you have prudent money depending on your ability. Whether or not to be aggressive in investing depends entirely on you and your financial situation. Being aggressive in investing is not wrong or obligatory. Being aggressive within your ability will take you a little further in your investment journey and will keep you moving towards your goals faster. Be careful that being aggressive does not put you at any financial risk and does not hinder your continuity.