Most people have trouble saving any income and frequently, 10% of their income can be a reasonable and even a somewhat aggressive target for a lot of people (even though surely some people have more discretionary income than others and if they make a lot of money, sometimes they can live a kind of minimalist lifestyle and end up getting up to decently high savings/investing levels). Many of the normies can make quite a bit of progress just by going from near or at 0% to 10%, and surely if they can invest/save more than 10%, then the is o.k. as long as their other financial matters are in order.
Although it sound interesting but hard to achieve that amount of %30 on regular basis expecialy on DCA strategy. Considering the responsibilities in the family. for example a country like mine, if you continue like this you will put yourself in financial jopady. For me I think %20 will be good to go. but if one can develop and nuture that characteristics, I think it will go a long way if there are other means of lively hood.
If you read what JJG has said, then it's not compelling you to invest 30% or even 20%. Depending on how big some people's salaries can be, even 10% of their salary is a reasonable sum of money that they can either save to invest or invest directly. In Bitcoin, one can invest any amount, even if it's $1. Currently, the Bitcoin transaction fee is as low as $0.2, so even if you see someone that you can buy Bitcoin directly from them via p2p, let's say you buy $2 worth of Bitcoin and you cover the fee for yourself, you will get $1.8 in Bitcoin. If you are accumulating like that on a daily basis, before you know it, you can even attain up to $12 in a week ($24 in two weeks and $48 in one month). So, do it in a way that doesn't affect you; just get a simple strategy that will not put you under pressure.
Ok, let me give an example of some experiences I had some days ago. There's this banking app I use, and with the bank, I have two accounts that are longed in on my phone. I am operating the two accounts at once for business and personal use. On that app, there's a savings plan named "Save as You ear/spend." When I noticed it, I decided to activate it on the two accounts. On the first account, I activated it to save $0.1 on every transaction carried out on that account; on the second account, I activated it to save $0.05 on every transaction carried out on that account. I did this some months ago, and then I even forgot I did set up something like that; it was just some days ago. I was thinking of how I could get some money to solve a pressing need, so I remembered I had a mini savings plan I initiated some months ago, so I tracked it and discovered I had about $168.1 in that account. Within that interval of months, I have done more than 1,000 transactions on those two accounts, and I don't quite notice or get affected by the small fraction that keeps entering my savings every time I spend. 'Cut story short, that money saved that day. This is not a fabricated story; it is what I experienced.
So, the point I am trying to make here is that you can derive a strategy for investing in a way that will not affect you. If you always look at your responsibility all the time, then you will end up not saving or even investing, and yet the responsibility will not cease to exist; you just need to learn how to discipline yourself to either invest gradually or save little by little to invest.