America isn't Ukraine, we are a *massive country with a nuclear deterrent,* wedged between two massive oceans and two friendly countries.
Nobody is going to attack us unless we go out into the world creating enemies.
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US of A has already created enemies.
See 9/11 for an example of "nobody is going to attack us" being false.
Could the nation slowly step back and generation-by-generation shed their national reputation such that they have no enemies? Maybe.
But that would take a while (generations) without any guarantee and is kind of the opposite of what has happened recently.
American security, and indeed the entire pax Americana has been predicated upon your country's network of global military bases and your carrier battle groups. This is what enables the USA to decisively influence any conflict anywhere on the globe.
Those bases would need to disappear in order for your comment to be true, and despite two thirds of your electorate who didn't vote against the future dementia ward patient currently in office, I don't think Americans are ready to accept a world where American foreign policy cannot be promulgated more or less at will, which is what isolationism would entail.