[Epistemic status: mostly contrarian listing or ideas I don't consider myself to have any particular expertise in determining the real answers.
Came out a bit more sarcastic than I had intended. But seriously what else can you do.]
I started writing a post called something like “5 narratives you will see about this election” last week, but didn’t have the energy for snark so gave up half way through. It seems that since then the media has settled on the narrative that they/the democrats/the general “liberal elite” didn’t listen enough to white working class Trump voter’s concerns. No-one seems very clear exactly what those were, but they are definitely very important and legitimate. And definitely not racist.

None of us know the actual reasons Trump won. Some political scientist will probably get their PHD explaining it in a few years time. But by then the narrative will have been long settled anyway. So for the sake of ideological diversity/contrarianism heres a few things that I’m surprised more people aren’t talking about.
Emails emails emails, or the FBI/Russia/Wikileaks

A technically separate, but narratively related issue, is the massive leak of Clinton campaign emails. Depending whether you believe the claims that wikileaks has been subverted by Russian security agencies this is, at best, a non-state actor actively intervening in an election via illegal means, or a foreign state intervening in an election at a scale not seem since the cold war. Nevermind that despite concerted digging through the emails Trump supporters have failed to find anything of note, other than weird pizza and child molestation conspiracy theories, (that’s sadly not a joke), it continued to reinforce the “Crooked Hillary” narrative. A potential foreign hijacking of a presidential election seems like kind of a big deal.
The disappearance of the “Obama coalition”, or where did the minority voters go.
The overall number of voters in this election as significantly lower than in 2008 or 2012, and it seems like lot of that came from a reduced turnout in the democrats who had voted for Obama, predominantly the young and minorities.
Two possible explanations:
Since the last election the Supreme Court overturned part of the Voting Rights Act, and many states have put into effect strict voter ID laws, to combat the scourge of voter fraud. Which, by utter coincidence, seem to make it more difficult for ethnic minorities, and other traditional democratic voters, to vote. Also the number of available polling places in certain areas has mysteriously decreased.
Other explanation, Obama was uniquely charismatic or Hillary was uniquely uncharismatic.
A large part of the electorate never votes, for lots of legitimate and sensible reasons, since it is a very inefficient use of your time as an individual, but something something collective action problems, and when you don’t vote you get screwed.

[There’s probably a useful discussion to be had here about the gendered nature of our expectations of ‘charisma’, but other people have done that better than me.]
Possible takeaway for democrats: Individual charisma matters a million times more than any other factor, including competence, select future candidates accordingly.
Systemic factors meant no democrat could win.
It’s incredibly rare for a party to get 3 presidential terms in a row, so the democrats were fighting an uphill battle to begin with in this election. The public always wants a change from the status quo, so any democratic candidate would have been in trouble. Hillary particularly was seen as a continuation of the status quo, and didn’t particularly differentiate herself from Obama.
The electoral college map is skewed against democrats, so you need a large najority to win. It’s a stupid system but its not going away any time soon.
There’s probably also a narrative to be had in the economy, job growth, unemployment, inflation, etc. Things are better than they were at the end of GW’s term, but they are still not great. Campaigning for slow gradual improvement is never easy.