My perspective is that a scale has tipped, a critical mass of people decided they want this sort of thing, and they got it. It wasn't rigged, it wasn't fraudulent, it was a democratic election. Critique democracy itself, or the criticism is incoherent. Make an argument for why a government should be disallowed from doing things that the voters want it to do.
It's also hard to quantify how much the pandemic and inflation moved some voters away from Biden/Harris.
I think Dems will win big in the next election. The question is how long this lesson will last with voters.