The president is more of a cheerleader than a person of substantial power.
You're literally using tactics developed by fascists in your argument here. Somehow, the president is little more than a "powerless cheerleader" if we're talking about Dems but "the end of democracy" if talking about Trump/Republicans. Both can't be true.
We kind of had that for 2 years when Obama and we got the affordable care act... Even then, the margins weren't that great; I don't think Obama was the problem so much as they couldn't find the support to do something bigger in Congress.
Even with those thin margins Democrats come across the aisle regularly to actually get governance done
The ACA was a plan written by Republicans. Obama and the Dems chose this over any sane single-payer option to allegedly "appease Republicans" and yet none of them voted for it (and then spent years trying to repeal it). This means we could have had single-payer all along instead of further cementing the private healthcare market that continues to bankrupt Americans to this day.
In another attempt to appease Republicans, they allowed them to steal Obamas SCOTUS appointment while also allowing Trump to steal what should have been Biden's SCOTUS appointment, stacking the Supreme Court with a 6-3 conservative majority which lead to the end of abortion rights in the country and who knows what else in the coming decades.
Neither party is interested in fixing the absolute train wreck that this country has become. Both serve the rich. One party is just better about messaging and branding. There are many good Dem politicians but the party leadership and party as a whole is just as rotten as the other. That's why we're here with Trump having a 50% chance of being president for the third time in a row and why we'll continue to have candidates like him in the future.