“The best remedy for democracy,” surely said by someone, “is more democracy.”

Diminished and endangered democracy when America, the nation, has never been a democracy? It has ALWAYS been an oligarchy, ruled by 535 elected people who are free to become predators.

However, the voters in the 18 states with the direct initiative, referendum and recall can elect legislators and not become prey.

Until the people here narrow the list of problems to about three and work on those, good luck.
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Having a discussion here on an agnostic site won't affect many.

BUT For what it's worth; here's my opinion;

There's two things that are affecting the growth or repression of democracy;

The growing population, and the human- and animal - instinct of greed.

One key is money, and the push to get more. It's clear that money buys advertising....and advertising changes minds. And it's also clear - to me- that the addiction to money - greed - will cause a decline in democracy, and the human condition.

I will add that as a scientist/demographer....the root of our problems is the growing populations...158 more births, than deaths, every minute. 227,000 every day. A millon more every 4.5 days.

This pressure - on our environment, on our governments, and on governments that want to govern democratically...has clearly been negative. Democracy is in decline...and the need to control people is obviously growing.

The solution - to me - is obvious.

Family planning. Changing the tax structure to incentivise small families, not large ones..could help us redirect.

Unfortunately - I see little progress in this direction.

[poodwaddle.com]

Money "buying" power through politicians.

Eliminate this and all the other problems go away.

Greed is our Achilles Heel. That will be the thing that brings us down. Most of the things on your list have been with us for a long time, some of them since the 1700's.