No, what got Trump elected is both the republicans falling in line en masse, and the lefty populists backstabbing democrats the entire time it was happening. This is why republicans support DSA — it helps democrats lose.
Mainstream democrats who actually know how to govern unfortunately don't have great rhetorical skills, easy slogans and sound bites, or the social media skills required to fight back against populist pundits. The mainstream media at one point also started going insanely harsh on normal democrats, while giving lay up interviews to trumpers, to avoid being accused of TDS.
Democrats fail to fight on both fronts because they often suck at being influencers, and are actually good at governing. They're boring government officials, nerds that try to actually tackle difficult problems in good faith, by taking all stakeholders into account, and finding feasible solutions.
Things are not simple. You're in a populist rabbit hole. It's easy to hate these suit wearing "corporate" dems if you don't actually appreciate the complexity of modern problems we're solving.