And you will pay a lot more for literally everything and some products will be either unavailable or with much lower quality. This will also drive inflation to new highs affecting the consumer purchasing power.
I can only assume you are an American, and I am sorry to disappoint you but you don’t have neither the manufacturing power, nor the workforce to handle all the manufacturing that is happening overseas anymore. Even if you want to switch to local manufacturing there would be decades until you build the know how build and equip the factories and to train the workforce.
Where do you think your TV or phone or microwave, vacuum cleaner, dishwasher, etc. are produced?
Not to mention that this will also affect your GDP in a negative way, as you will stop being able to export locally produced goods, because of those protectionist policies.