Political writer and YouTube creator Ian Danskin put together a series of videos in the aftermath of the 2016 election to explain what we Democrats did wrong, and how we need to engage with the Alt-Right (now known as the Republican Party). The whole series is worth watching, but if you want to skip to the end, watch this one:
Some things have changed since 2017, but not as many things as one would hope. We need everyone in the Party to understand the core message of the above video: we need outcomes, not just process, if we're going to save democracy. Think of LBJ, not Walter Mondale, for f's sake.