Democracy in the US is not in danger. A handful of hours of disorder, some of it violent, wasn't the end of days for elections and democratic institutions in the US. They recently had prolonged violent rioting in a few cities, and it wasn't the end of democracy. They've had prolonged violence and unrest at other periods, and it wasn't the end of democracy.
"Democracy in danger" is QAnon for progressives and anyone else who decides to wear that tinfoil hat. It's an electioneering slogan, a device to generate FUD. Note that they've invented a new term: "semi-fascism". It's not "fascism", for which they've been repeatedly taken to the woodshed for misusing, but a made-up term which can mean whatever they say while carrying the visible taint of "fascism", which is really what they want it for. Try and get them to define what it is, and when they do, measure their behaviour against it.
The chief risk in the US right now is that the people bleating "danger to democracy" will use the alleged danger as their excuse to do things that actually do undermine democratic institutions, including the fundamental one: trust.
Democrats are the ones who most often express desire to change the fundamental rules for elections (eg. electoral college); to stack or otherwise alter the USSC; to add states purely for the purpose of rebalancing the senate; to narrow the scope of the First Amendment; to narrow the scope of the Second Amendment (a lot).
Objectively, Democrats are the greater threat to the status quo constitution and the institutions it lays down.
