At the moment, I'm not much interested in the million and one liberal narratives floating around online explaining "why she lost"—all with remarkable certitude. Emotions are too raw and people are mostly just relitigating all their old grievances. But when a party suffers a six-point swing against it in every single state, the problem is something big and fundamental, not whether Kamala was chosen too quickly (please) or the press didn't tell people how bad Trump is (they did). A biggish slice of Americans just don't like the dog food Democrats are selling.
At the moment, I'd say the single most widespread self-critique is that Dems have abandoned the working class, so it should be no surprise that the working class abandoned Dems. The assumption generally is that we abandoned them economically, with no willingness to consider the possibility that liberals need to reconsider their cultural values. I suspect that's a serious mistake, but for now let's go with the economic argument.
Here's my question: What, exactly, can liberals do for the working class? The Trump answer, aside from rhetorical support, is basically (a) small tax cuts and (b) revenge against China for taking away our manufacturing jobs.¹ In other words, it's all vibes, since neither of those things will make the working class noticeably better off.
Kamala Harris's answer was a few small bore things like help with down payments. "Retraining" has historically been a popular suggestion, which wildly misreads what displaced working class folks want. Safety net programs? Liberals have long been hellbent on phasing them out at low income levels that bypass the working class. "Buy American" is popular with both parties, but it rarely gets enforced seriously and people are rightfully cynical about it. This kind of stuff just won't do the job.
I honestly don't know the answer. The problem is that Democrats have been remarkably successful over the years, leaving very few big-ticket social welfare items undone that might genuinely make a difference. Universal healthcare is the obvious exception, and putting long-term senior care under Medicare might be another. But they're both expensive and extremely difficult to pull off politically.
So if we confine ourselves to economic answers, there's not much available. Inflation was supposedly a huge issue this year, but if so it just means Democrats were doomed. Inflation was caused by the pandemic and ended by the pandemic. There was nothing anyone could do about it.
What's the answer? If we refuse to discuss culture-war moderation because, by God, those are moral issues and you don't compromise on morality, we're stuck with purely economic appeals to the working class. But what?
¹Some might add immigration hawkery, but I wouldn't. I feel pretty strongly that when you dig down, anti-immigrant sentiment is far more cultural than economic. "Oprima dos para español" pisses them off way more than the jobs virtually no white people ever lose to illegal immigrants.