I say bring back the CCC.
That was a response to a particular situation, and I don’t think it would really work today. It was a very expensive way to get some park lodges and bridges built and historical monuments restored.
Young people today have many more options than the equivalent population in the 1930s: they can attend Community College and learn one of a hundred marketable skills at a very modest cost; they can join the military; they can get a retail job, be patient, and move up; and more.