So far I have no income that I can set aside because I don't have a fixed income such as a monthly salary. So for me, depending on the income I get from working part time, if sometimes I get a large income, I set aside half to invest in Bitcoin and the other half for daily living needs and also other family needs.
Well, if there is no passive monthly income, it will be difficult for someone to invest regularly in Bitcoin every month. But this doesn't seem like a big obstacle because of course someone has an income every day, sometimes large, sometimes small, so if today income is greater, we can set aside some to invest in Bitcoin. I have seen many of them who invest 10% of their salary regularly in Bitcoin every month and that is a fairly stable percentage if they get the same salary every month.
So I invest 10% and sometimes 20% of my monthly income in bitcoin. But that could change because if I get additional bonuses I will allocate more to buy Bitcoin. It all depends on themselves and how well they can manage their finances so as not to lose balance if something happens to their economy.