You are either being silly or intentionally taking weird positions.

• the current prices are set by the market. If an artificial influence like a tarrifs overnight makes part of the products a certain percentage more expensive, the market will readjust to this new reality. Since companies love profits, it will adjust upwards to get as close to the increased conpetitors price while keeping your advantage.
• “at home” for a lot of companies is not the US. Your reasoning is poor here, companies are driven by profit not feelings.
• No it’s not easy indeed, see previous point. And the competitive edge the companies have by staying in cheaper countries helps them be competitive in the rest of the world.
• it worked? The Trump tarrifs stayed under biden… cause flip flopping policy is sometimes worse, and removing the tarrifs without china removing theirs will just make things worse. Did your stuff get cheaper? Or is that Bidens fault?