It’s been said a bunch, but trades. Learn to be a machinist, carpenter, stonemason/bricklayer, plumber, gunsmith, farmer. Anything where you work with your hands. If you don’t like any of these, learn to code, be a programmer or network administrator, or take some classes to be a paramedic, EMT, CNA or nurse. CNA/Nurse will be needed more and more as the boomers age, the only drawback at the moment is many facilities require vax, but that will change too. It is not a job that can be replaced by robots, yet. If I had it to do over, I would be a machinist or stonemason and work for myself instead of for big corporations.