If it's a lifestyle similar to 996, with a purchasing power of only five to six thousand a month, forget about six to seven hundred million births a year, there might not even be twenty million.
Now, ordinary workers only need to work four hours a day for legal working hours, and three days a week. Special professions can extend to six hours a day, four days a week. Their income can support the lives of at least thirty people, and this lifestyle is truly the kind of affluent class lifestyle level that was unimaginable in the Earth Era. The food, clothing, housing, entertainment, cosmic tourism, and so on can all be enjoyed by thirty people with just one person working.
Moreover, the gap between rich and poor is very small, which is crucial!
In this era, work more often means pursuing one's dreams, seeking achievement and social honor, rather than just supporting the family.