COVID harmed most industries that rely on manual labor. Suggested reasons vary, one is that people discovered they could do mental-work, and preferred it (and apparently it never occurred to them before). Another reason is many retirements and a gap in knowledge transfer to the next generation. Another is a huge increase in demand for non-physical work during COVID that never went away, leaving other industries short handed (and it's not a pay thing, there's not enough people for all demand in all industries, someone must run short).