Well certain industries at the moment are very safe. Manual labour - plumbers, electricians, groundskeepers, machine operators, carpentry, tree surgeons, brickies. Sport - running, baseball, football, personal training, gym management, physio, sports massage, osteo. Skilled care - doctors, nurses, carers, pharmacists. Police, fire, ambulance, army.
I think anyone looking to re skill should be looking for a safe bet industry where there’s always work, and that work is only going to go up in demand and price.