You can blame the DNC for being useless and out of touch but they always have been, nothing changed there. You can blame them for their shitty messaging and not listening to the concerns of working people ... ditto.
What changed in this election is that millions of people, who know Trump is a a liar, a criminal, a rapist, a narcissist ... I could go on and on. Well, they decided to vote for him because none of those negative traits were sufficiently off-putting.
This was a test of the collective character and morality of the nation and the United States failed that test miserably. Put it down to a poor standard of public education, Russian/Iranian/Chinese propaganda, accelerationism, racism, misogyny, whatever mix of reasons you're comfortable with. Could the DNC have done better? Absolutely. Would the DNC doing better have won the election for Harris? Probably not, given the margin of victory.
It’s time to take an honest look at DNC leadership and ask some difficult questions - why aren’t they interested in doing more to actually win votes? Will they ever learn that pandering to corporations for bribe money is a losing strategy?
Besides, Trump actually got fewer votes this time around than 2020. So your premise is flawed there too. It’s just that Harris and the DNC got way less. Dems lost this one and if you ask me it’s because of their Israel First policy and fierce commitment to ongoing genocide and denial of reality. Couple that with insane inflation directly and negatively impacting people's material conditions, and somehow Trump was able to pose as the change candidate. Politically, that’s all that matters when the people are miserable.