As long as you believe and want to invest in bitcoin then you definitely know what you will do. 30 percent of income if it feels too big then you can reduce it to 20% or 10% according to your own strength.
Many here are married but in the end they can still do DCA consistently. This indicates that belief can make us think more broadly and not only fixated on economic conditions because in the end when good management is done and you know how much income and expense from your income actually it can be a gap to make some changes if you want to invest and it depends on yourself whether you want or not to invest.
someone that doesn't have an investment mindset will always find excuses to give to support his belief. Your mentality plays a great role in determining the kind of decision we make, while some can decide to invest like 20% of a months salary and hodl and just forget that such amount ever enters there hands others will be considering the immediate thing they can do with such amount. If in the long run, they investment pays off, the later regrets his inaction while if it doesn't pay off, since you've already counted that money as gone you won't feel that bad. That's the reason we are advised to invest with an amount we can afford to loose without any serious effect on us.