I think that perhaps by a combination of natural artificial conditions there is a population count we are destined to approach, and we are on the wrong side of that. Adding immigrants will eventually lead to mostly childless or low birth rate 2nd gens. Western countries have become rather antinatal in the 3 branches of government.

There is a government program where people are paid and given a home to move into in Italy. Now there's a video about countries you should not move to. One such country is Italy. Why not? There are too many rules too many regulations too many taxes all of these things make raising families very challenging in these places. No jobs in these rural areas so where is the money to come from that the government will want to collect from you? And how does the Italian government expect you to somehow pay for everything?

Perhaps we need to reverse all legal changes that have happened since the time when the population growth was the highest. That was the '60s. The African countries are doing something right. I don't know what it is though