Although my best advice for poor people that wants to enter Bitcoin investment for the long term is that they need to understand financial management. If you're poor that your income cannot cover your basic expenses there's no need to force yourself into Bitcoin investment because you'd end up selling prematurely to take care of your basic needs. This will make you to deviate from DCA method because it'll defeat your goal of long term hodl. Make sure you have a functional discretionary funds before getting into DCA method.
If your income barely covers your basic needs, Bitcoin might not be your starting point. Without financial stability, you will likely be forced to sell during market dips just to cover expenses, which can ruin your long term strategy. For me I can say that DCA works best when you can invest consistently without touching your stack, even in emergencies.
Before committing to DCA, build a discretionary fund money you can invest without affecting your daily life. This safety net ensures you would not break your plan when prices drop or unexpected bills come up. In Bitcoin, staying in the game matters more than rushing in, and proper financial management is what keeps you there.