Why are you aggressively investing in Bitcoin if you have a fixed source of income? Investors are prioritized to have a fixed source of income in the early stages so that they can continuously purchase Bitcoins through the DCA strategy without any interruptions. There is a difference between a fixed source of income and a backup fund. A fixed source of income in the case of investment refers to the amount of money the person making the investment earns monthly from a job or business. He will regularly buy bitcoins with the remaining money from his monthly income excluding family maintenance and other expenses.
There's nothing wrong with being aggressive in our bitcoin investment if we can do it in a way that will not stop us from solving our daily expenses. Being aggressive in bitcoin sometimes can help us increase our bitcoin size. For instance, if an investor is using $10 to accumulate bitcoin monthly with the DCA strategy, he will still not accumulate a good quantity of bitcoin even though he has accumulated bitcoin for 5 years. So there's room for him to be aggressive in his bitcoin investment at some point if he gets extra money or a bonus from his place of work.
Moreover, many investors keep backup funds in their investments with the DCA strategy, essentially for buying in lump sump. When they face dumping periods in the market, they take the opportunity to buy more bitcoins with the backup funds at lower prices.
You are the only one who uses his emergency funds or backup funds to lump sum on bitcoin when there is a dip. But I want you to understand that backup funds or emergency funds in bitcoin investments are meant to buy the dip or lump sum on bitcoin. Backup funds or emergency funds are to be used when there are unforeseen problems. For instance, when you need to repair your car, you will depend on your emergency funds to fix it.