The fact is that Hillary did at least bad enough to let Russian "hacking" and Russian hacking tip the scales in Trump's favor. She was bland, vaguely unlikable, and nothing any different from the old policies and logic chains that were and are slowly rotting America from the inside out. She was a incredibly poor counterpoint against Trump, who, while equally unlikable and thrice as retarded, had flavor and pizzaz, and controlled the media cycle, and had new and innovative ideas, even if they were utter trash and pretty much as cartoon supervillainish as real life people tend to get. Clinton wasn't hated, she was forgotten, because she faded into the background noise of the political systems as a faint blue light, while Donald Trump was a big flashing button labeled DANGER, and people, particularly in large groups, are quite dumb, so being a big flashing danger button is a virtue in the political world.
Clinton may have been an okay President, but she was a godawful leader and couldn't inspire anyone to motion. Couple that with her faith in the polls proving unfounded and she was as responsible for her own loss as Putin was.
What the dems need in the next presidential election is a willingness to throw out what used to work and try new things. Actually counterpoint Trump, not shy away from scandal or calling out their opponent in no minced words. Drop the politics entirely and meet Trump blow for blow. I think at this point publicly (and tactically) dropping a curse ala "It's a big fuckin' deal Mr. President!" would benefit the Dems more than hurt them - and if they really just want Trump ousted they need to get the focus off of abortion. That's the single, sole issue for a lot of religious voters and Hillary's pro-choice stance, while morally admirable to Dems, utterly alienated her from a large section of what would become Trump's base today.
Put the focus on reforming welfare to both work better and cost less. Especially with a Dem congress I could see that going over well. Put the focus on Trust-breaking and Corporation crushing - People fucking hate modern corporations because they're becoming cyberpunk monsters. Put the focus on equal rights for everyone, while simultaneously rejecting the SJW Extra Plus Plus on the end of LGBTQ+ to show people that you're taking this shit seriously and not just blindly wandering left or right. People like gay people but they've started to become interlinked with other, weirder Tumblr genders and Other-kin weirdness. That's what I can tell from browsing right-wing sites nowadays anyway.