I personally believe that starting small is one of the best ways to actually learn. You feel more involved when you have something at stake, even if it is just $20 or $50 DCAing. It makes you pay more attention, and that is when the real learning kicks in. Read more, ask questions, and gradually get better over time.
The experience is nice, but considering that many of us have no choice but to do the DCA because we don't have 1 BTC, it's the best option However, if we have the option to buy BTC, there's no need to think about it. You have to have BTC, and afterward, there's nothing better than having that peace of mind.
If the goal is to accumulate to get more BTC, then what you're saying is good: 20, 30, 40 USD every time you can, accumulation is the most advisable.
However, a stable source of income is important in order for you to keep your bitcoin accumulation ongoing consistently and persistently for 4-10 years and above. Since you have bought your first bitcoin, it shows a sign of commitment because you bought even when you don't have an income. You can look for a means of income with a discretionary income so that you can continue your bitcoin investment.
This is very true, there are no excuses for not having BTC , you have to make an effort to obtain Discretionary Income , I know that when you have a Stable job time is the problem , but everything in life Requires sacrifices and if it is to have BTC it is worth doing it.