I am not a Trump voter, but here's my understanding of what they're hoping for, economically speaking. By devaluing the US dollar, American manufacturing becomes more appealing to other nations. I think it's generally believed that tariffs are a pretty lousy way to boost domestic manufacturing, but I think it might be an effective means of accomplishing the goal of devaluing the dollar. This devaluing shouldn't have any direct, negative effect on Americans when buying domestic (e.g. home prices, locally produced food), but will significantly reduce your ability to travel or buy imported goods.

Again, I'm not a Trump voter and I think this is the clumsiest, most dangerous way to bring manufacturing back to the US, but that's my understanding of what their goal is. I'm not even going to touch the Christian nationalist side of the plan.