There are 8.3 Billion people on the planet and there were 7.5 ten years ago. We have enough people. We have enough resources for everyone to live comfortably and be well in their communities. We have more than enough money and other valuable things to trade.
The main thing getting in our way isn't a low birth rate.
Anyone genuinely concerned with the depopulation of humans in 2026 is probably some flavour of breeder cult weirdo, and the only ones constantly banging on about it in politics, academia, the news, etc are imperialists, industrialists and racist patriarchs. IME.
