It’s not overpopulation. We are seeing the results of late stage capitalism coming into effect. When you design the economy around an owning class vs a working class, the owning class will use its inherent leverage and capital to beget more leverage and capital. That happens at the expense of the working class. If your income mainly comes from working for money, you are part of the working class.

The obvious solution here is to change the economic structure to not have an owning class at all or at least to keep it in check, but liberalism is not good at keeping it in check and leftism doesn’t have the momentum needed to change the world economic structure. Right now all we can do is make progress where we can, which means passing legislation that taxes and weakens the owning class in favor of supporting and empowering the working class through social programs and better pay and benefits. Unions will help you a TON here and more quickly than legislation, so look into joining/forming a union. Biden has changed the requirements for forming a union to make it really easy now. The other thing we can do is prevent fascists from tearing apart the systems we’ve built to allow that to even happen in the first place. That means not voting for or supporting right-wing politics.

None of this is caused by overpopulation, and the myth that overpopulation is the main source of your problems directly benefits the owning class who is currently winning the zero-sum dynamic of owning vs working class. That dynamic is the reason things are bad and worsening. Join a union and vote for the most progressive viable candidate in both local and federal elections.