Can you imagine the world today if Bernie had won?
Unless the Sanders Administration had a very favorable or majority Democrat Congress aligned with his progressive wing, many proposals would be outright blocked or heavily compromised. Knowing our limitation that everything else has stayed largely the same as history since, this wouldn't be the case. The hypothetical administration's attempts at sweeping reforms, such as healthcare and climate regulation, would very likely be significantly curtailed or overturned by courts or constrained by constitutional limits on separation. The GOP, even though they actively outspend Democrats when in power, obstruct via financial limits each and every Democratic-led effort while crowing about expansion of debt incursion; as such, spending on Bernie's proposed initiatives would raise concerns about deficits, inflation, and taxation. Even with tax increases, there would be pushback from wealthy individuals, corporations, and lobbyists.
Basically, nothing would change in any significant way except, perhaps, the SCOTUS would not be outright overturning DECADES of 'settled law' in favor of an absurd view of the world as it was hundreds of years ago.
This is a feature, and why Trump's second term is so different to his first, or Bidens, or Obamas, or Bush, or Nixon. You'd probably have to go back to FDR for such sweeping changes to the US state.
Trumps first term was overturning norms in behavior, but not overturning the way the entire governing system works, all four estates.
The good news is when your candidate loses you don't find out the evil they really do and you can say it is not your fault. The bad news is you don't find out what is bad about the things you think are good.
Now, that might not have worked but anything might have had a pretty large impact on global/US deaths.
But his support of ratcheting up the Ukraine war disappointed profoundly. That’s not the Bernie I would have voted for.
Sometimes you gotta rip that bandaid off.