The general state of the global economy, late-stage capitalism fucking everyone who isn't a literal millionaire over, climate change, general political instability, the mentioned rise of authoritarianism, etc. All of those are vastly more influential than "social media, enshittification thereof".
They may well go hand in hand. Through social media we are all bombarded with messages about how fucking terrible everything is on a daily basis. Unless you are incredibly selective about your social media usage, you can't spend 10 minutes on a platform without seeing some kind of stressful or depressing or outrage-inducing news.
It used to just be home-bodies and elderly people who sat in front of news programs all day, but now it's all of us. Bad news generates clicks, and there's plenty to be found.
The general state of the global economy, late-stage capitalism fucking everyone who isn't a literal millionaire over, climate change, general political instability, the mentioned rise of authoritarianism, etc. All of those are vastly more influential than "social media, enshittification thereof".