Buying aggressively all the time is not a good idea. Because if a person buys aggressively every time, if he needs some amount of money, then maybe that person can get very broke. For example, if a person invests with 80% or 90% of his discretionary income all the time, then when there is a small financial crisis, he will have to depend on his emergency fund or take a loan from someone. But yes, how much % to invest is completely their personal choice. But I think it is right to invest 35% to 45% of your discretionary income. Because it will not be too aggressive and not too low.
You can continue to buy continuously by adopting the DCA method and if you see a decline in the market, you can buy aggressively if you want.
If an investor is strictly investing in bitcoin with his discretionary income, he is free to invest in bitcoin with all his discretionary income if he chooses to do that, and he will not have any problem in solving his living expenses because discretionary income is meant to be used and paid for non-important items like vacation. Any financial crisis that happens after you have paid for your monthly expenses should be treated as an emergency because you don't plan for it, and you can freely depend on your emergency fund to solve the financial crisis and keep investing in bitcoin consistently.