Nothing other than full on revolution, the US electoral system is set up so that we are forever mathematically doomed to only two (remarkably similar) options:
As long as we have capitalism and 'First Past the Post' representation, billionaires will control everything. Sorry to be the bearer of bad news.
The billionaires problem is real. The lack of fallout/accountability after the bank shenanigans of 15 years ago disheartened me mightily.
I do not favor revolution on the general principle that they tend to decay into a fascist ground state, to use a physics metaphor. Lenin’s Russia is a good example.
So I seek ways of effecting change within the system, which leads to scenarios for improvement that have high inertia barriers and low outcome confidence.
Even so, I am at this time a committed Democrat voter on pragmatic grounds. The Republicans have publicly admitted they want to go to a frankly religio-fascist model. Yuck.
The Democrats as a result have become the reservoir of comparative reason, and really the only gambit to block the Republican program, which I read as an existential threat to a representative government.
More wistfully, I’d like to see a bit more social democracy. Heavier taxation of corporations, but short of the risky step of collectivizing the means of prosperity.
But how to get there from here, (expressive shrug). So for now prudence dictates that I play a defensive game, which is a bit tilting at windmills, since though my state is blue, my district is hopelessly red.