Infrastructure expansion like trains
We'll see. Congress doesn't like the president spending money without their explicit approval. At this stage of planning, it's little more than grandstanding by the president.
investing in education
See above. Congress undid Biden's first attempt at debt relief. It's still unclear if the second attempt will pan out. Cool if it does though. Still an if.
healthcare plans
The ACA really only pays out for people far enough below the poverty line that they basically don't have income. My wife and I make $50k/year. Not even enough to own a house here. I still shell out $600/month for basic healthcare for two, with a $1000 deductible we each have to pay before the insurance even starts covering costs. And that's considered a good plan. Deductibles can legally be as high as $10,000 per person before insurance starts paying anything.
The ACA isn't exactly a shining achievement for democrats.
environmental programs
I'll give you that one. My state is building and opening the largest carbon capture facility in the world so far, because of democratic policy.
etc
Etcetera is what people say when they run out of examples. By my count you've got 1 (one) example of good that democrats have done that has actually materialized and isn't in jeopardy of failing as soon as someone actually has to approve the funding. Most democratic policies die in congress.
But of course you already know of all these so why do you need to ask the question?
No need to be an asshole, I'm just here demonstrating for you that the broad strokes you're painting are not even close to the actual situation.
(I'm not even from USA myself, but your Republicans have such deranged policies that it spills over to us in impacts on trade, etc)
I'm with you on this one. Republicans are deranged in general. But it's abundantly clear that you do not live here. Democrats had 3 years to do something constructive, and they mostly haven't even managed to undo the damage Trump has done, let alone enact policies that benefit the majority of Americans.
In fact, democrats lost a major civil rights battle during their tenure (Roe v Wade) without even putting up a fight. I absolutely cannot blame democrat voters for being disappointed.