Why not increase them 500%?
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Increasing tariffs from 0% to 20% is already an “infinite” percentage increase , far higher than your 500% suggestion. I for one am disgusted with the quality of goods available.. even simple things like a manual can opener are available at $1 in the dollar stores and they barely work and fail almost immediately... OR you can pay $10-$15 for a “better” one that is also made in China that works acceptably for a short while... I’ve bought 2 USA made can openers at garage and estate sales that are likely 30+ years old that work wonderfully... We can compete at the current price levels with higher quality.
That is a red herring that has nothing to do with trade policy. If something is cheap, it should not be expected to last long. One interesting question is whether an industry can even survive if it produces consumer products that last 30 or more years.