Everything you said has nothing to do with the left, they are basic as shit things that event center and center-right European parties would do. I mean, what does the sentence "did green energy" even mean to you? The US is one of the largest polluters per capita in the world, installing a few solar panels means jack shit. Starting to heavily invest in public transportation, putting forth serious proposals to reduce the use of plastic, etc. would just be a start.
Meanwhile, they were also running on an anti-migration platform, just not as bad as Trump - remember how Democrats were so proud of the fact Trump shot down a Dem proposal that would reduce immigration?
Also, remember when Obama was elected on an anti-war policy in 2008? He even won a Nobel Peace Prize! And remember how Trump was elected in 2016 on a "pull back troops from the Middle East policy", standing opposite to "Hillary the Hawk"?
Meanwhile, while most of the world condemns Israels actions, and millions of people in the US protest the US involvement in the ongoing genocide, both candidates are in favor of supporting and giving weapons to Israel.
If your argument is "but Biden was so far left", then you're a perfect representation of what is wrong with the Dem party and the US in general.
Edit: I almost forgot this beautiful (\s) fucking cherry on top: Dick fucking Cheney endorsed the Dems. And you seriously wanna make the argument they couldn't have gone more left?