It seems like what happened is that voters without economic knowledge think the president controls inflation, as opposed to it being the inevitable consequence of price rises worldwide due to a worldwide pandemic.
They don't like that eggs went up in price so they elect the opposite party. They think Trump will bring prices back down because he's a businessman, even though his tariffs will be hugely inflationary.
I'm not sure what kind of an honest DNC conversation would be able to address this.