Even if you are not financially stable if you have an extra $10 at the end of the week to meet your family's daily needs, you will still strive to buy Bitcoin because you are saving your financial success for the future. Your goal will be to try to get a decent Bitcoin portfolio and reach your goal by accumulation Bitcoin continuously for three cycles.
I would not discourage investing $10 at the end of the week. It would still be a commendable step if you invest from your discretionary income at the end of the week, it can be any significant amount. If the amount is very small, then you can save that money and do monthly DCA instead of weekly DCA. Because I think it is better to invest $20 a month than weekly DCA with $5-$6. Even if there is a small amount of money left after meeting your daily needs and if you think that this money is unnecessary for you and will not be needed for a long time, then you should save it and do DCA conveniently.
In this case, you need to ensure that you have a source of discretionary income, non-recurring money and the ability to build a backup fund (emergency fund). If you cannot find any money to build a backup fund after bearing all the expenses and selecting the money for investment, then I think your source of income is not prudent and investment is high risk for you. In this case, you need to work on improving your source of income first. In some countries, having $10 left over every week may be enough for investment. Because if you calculate it on a monthly basis, it is $40 and from there you can build an investment fund and a backup fund. Because the costs are low there and therefore it will not be too difficult to accumulate 3 months of expenses in an emergency fund.