America will withdraw from anywhere without a direct financial benefit to the administration. This creates a vacuum and blond spots that will be filled by the US’s adversaries, creating an even more opaque playing field for the US.

Heavily tarrifed sales to the US will be paid for by the US citizens while at the same time non US companies will see their sales in the US decline. If he removes income tax, this might be a bump in take home, but won’t offset the rise in prices, especially not if US companies will just raise their prices to as close as possible match the non US alternatives making record profits.

Trump will demand countries pay for us protection, but having shown to be unreliable, this might mean some short term income for the US, the countries will scramble to be independent from the US and the US MIC as they cannot be trusted either (the us might stop sales, or even turn of supplied weapons).

The same for Ukraine, most likely Trump will just tell Europe to poney up the money and as long as the EU has no alternative they will have to, or they will allow Ukraine to fall, blaming it on trump. Regardless the relationship between the US and the EU will dramatically sour.

Since the EU is in an energy crisis, most likely Trump will try to price gouge the EU here as well… on the other hand, drill baby drill could mean cheaper energy overall giving him severe leverage over countries in the middle east.