If you don't have a reserved funds one can still build it along side his or her Bitcoin investment, all what you will do is to bring out a percentage from your Discretionary income and then use it to build his reserved funds and even build other back up funds and at the moment of building this funds one should not be aggressive in his or her Bitcoin accumulation in other to prevent reaching a fuck you stage where you now have to dip hands into your Bitcoin investment.
You're already going aggressive the moment you want to build a force reserve funds so you can accumulate more coins aside the DCA you're doing. Investing in bitcoin is not something you do desperately because you see others doing it. Remember, there are other issues to take care of with reserve funds and not only to invest in bitcoins again, again and again.
Quite alright, I know the importance of investing in bitcoin but I don't see the necessity of building a reserve funds if you are not well to do because it's definitely going to affect you in the long run and probably affect your normal DCA method too. As long as you are consistent with your DCA, you're good. Leave reserve funds for people who are financially buoyant.