Sadly I tend to agree with your sentiment that democracy is under the threat as it is here in the UK. Trump is an incompetent clown who's only talent (if you could call it that) is lying and gas lighting people like the Nazi's did. His Goebbels mantra of the big lie “If you tell a lie big enough and keep repeating it, people will eventually come to believe it.All of the evidence about Trump's criminality - however conclusive and condemning - is, unfortunately, irrelevant.
Trump stated this fact himself a long ago: "I could stand in the middle of Fifth Avenue and shoot somebody, and I wouldn't lose any voters, OK?"
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Democrats need to wake up - the other side isn't going to play fair and they don't believe in Democracy.
What's the best way forward?... Somehow engage with the Right and support legislation that would help them. Try to overcome gerrymandering/voting rights restrictions. And jail those - including Trump - who participate in illegal campaign activity.
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Democracy itself is under siege in America - I'm not at all confident that Democracy will prevail in the next 10 years or so.
Trump isn't the problem its the next guy the smarter Republican who comes in and runs with all this, With a more smarter more sophisticated operator who knows what will happen? The problem know is that the Dems are so hell bent on nailing Trump that they are gonna lose sight of what is happening. They need to stop attempts at voter suppression whilst tightening up the legislation in terms of executive priviledges of the President. Trump should be a belweather and warning to the US how weak the supposed checks and balances really are.