Ironically, world without US would look less secure to me

On the other hand, the world wouldn't have wars and coups, caused by the USA.

If the US goes down, they won't be able to NIMBY over South America. Those countries can rise to prominence on the world stage.

I, too, am actually terrified of this yet still looking forward to it.

we can’t ignore the fact that it was keeping other major powers in check

But otoh it was also always the major power stirring the pot, and more so recently. So much that that argument doesn't hold anymore imo.

Is it possible that your security is unsustainably expensive and comes from the exploitation of human rights in other places? Why was it necessary for the people of Afghanistan, Iran, Iraq, Syria, Yemen, Somalia, Nigeria, Libya, and others, to pay for your perceived security?

I also find it hard to believe that China has had little military engagement for the last 25 years because it's worried about the US. Up until 5 years ago it was the US's top foreign Treasury security owner.