Imo, retraining depends on how old or young, sole income needed or part time income needed etc...like anything else, the fields requiring longer training pay more...but one can start out as a pharmacy tech for example, and get additional certifications than the basic over time. I'd advise any younger (or young thinking older person who expects to work X years ) to get retrained in health care, dentistry or other high demand field, or just work in something you like...if one can develop a talent or skill or business that is even better but sometimes an income to pay bills is needed.
Strong people (often men unless one is a stronger than typical woman, I am fit but not that strong, five foot two female)....jobs needing some strength pay well... as do some govt related jobs likeTSA airport security...pay is avg for TSA but good benefits etc...in any field one can move up to supervisor or specialist but one has to start somewhere. Any jobs with tips and cash can pay well, valet parking or waiting or bar tending...we get very isolated in appraisals and forget it's a big world out there and have to put aside some prejudices about certain kinds of work ( at least I did)
Keep appraisal license and do what orders come along while training...very individual how people will handle the hard reality of not just the present slow down but the critical mass negative changes on res lending side that seem to have reached, or are fast reaching, a tipping point.