The UN is a diplomatic structure that exists to give state’s representatives a place to gather and talk. It’s not a world government. If it had been created with the intention of being one, no one would have signed on.
For a “place to gather and talk” they sure do use a lot of money and resources. Maybe they should switch to remote work lol

The UN budget for 2025 was $3.7 billion.

ungeneva.org/…/general-assembly-approves-372-bill…

For comparison, global chewing gum sales in 2025 were $48.68 billion

www.statista.com/topics/1841/chewing-gum/

General Assembly approves $3.72 billion UN budget for 2025 | The United Nations Office at Geneva

The United Nations Office at Geneva
That explains why the UN doesn’t kick ass.