There is more than enough room for 8 billion people on Earth. They can all fit in a small region of any state with room to spare. The problem is all the crap they create daily. Lots of aholes exist. That’s what makes life unbearable for many of us.
Yes most nations are in a population decline outside of immigration. Even India is falling in its number of births. I know it might be too soon, but a readjustment to a falling population will be neccessary.