The three solutions outlined are not entirely aligned to your vision of doom.Right back at ya buddy....
https://www.science.org.au/curious/earth-environment/population-environment
We could do this all day, both valid arguments, I believe that ultimately war and famine and resources will be our downfall, but hopefully the strong survive and not just the rich and powerful, and we can build again.
It is though a prediction game and whether you believe population will peak at 11 billion around 2100 or peak at around 9 billion at 2050, depends on how quickly you think fertility rates will fall.
The solution is for more females to move to cities and get educated. So good production will need to become more mechanised. Growing your own food via hydroponics sounds like a positive step.
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