The sad thing is, despite our bad full-time employement statistics, we're still doing better than most of the developed world with full-time and part-time employment figures.
This is important to remember. In terms of economic growth and unemployment, the US is doing better than almost any advanced economy. We could do better, but the examples of Europe show how it could be far worse. For example, Spain has a 45% youth unemployment rate (it was worse, 56%, before labor market reforms). US youth unemployment is 9.9%.
Could the US do better? Yes. First allow huge amounts of housing to be built in the most productive US cities (i.e. stop NIMBYism). Then start tackling reducing federal regulations (Jones Act, not allowing foreign airlines to serve domestic routes, allow oil exports, end ethanol mandate) but especially local regulations (2 years of study to get a hair braiding license, anti-Uber rules, make it easier to run a child care center).