Well a bunch of people chose/were forced to retire when this all hit, a bunch still don't have daycare for kids yet and really don't want to get sick from their little walking petri dishes, and many probably decided the field they were working on has no future moving forward so their layoff was the spark they needed to decide to go elsewhere. What companies/ industries are seeing a workers shortage? The ones that don't pay shit, had hiring problems before the pandemic, and are being rapidly replaced by automation and equipment.
Much like the so called "skills gap" bullshit, it's all a lie unless everyone has to raise wages to try to compete, which of course isn't happening. Supply and demand work both ways, and a massive hiring drive by everyone simultaneously should be driving wages thru the roof in the short term and long term, which of course it isn't. Instead Republicans are trying to claim that unemployment is why everyone is staying home, as if 500 a week is a livable wage. The dow Jones has increased by 3.4 TIMES in the past 20 years, but if wages climb at all everyone starts bitching and moaning about hyperinflation like were going to have to burn cash for heat like Weimar Germany. In reality, the pandemic simply extenuated and accelerated trends that have been in place for decades, honestly since the 70s since wealth has grown exponentially while wages have been more or less stagnant.