Yeah, we all do. We disagree about what that might be, but at a very basic level, we're all on the same page. The past few years have dragged us to the brink, and it ain't pretty.
Sorry, but this is clueless. The two major parties have major differences on lots of policy issues: the social safety net; appropriate taxation; appropriate kinds of public investment, vs. leaving things to the private sector (everything from infrastructure to education); etc., etc.
Yes, the politicians in both parties cater to those who finance them. Sadly, they more or less have to, given that the money they raise determines how they can use often manipulative advertising to persuade mostly clueless voters to vote for them, and not for the other candidate. But underneath that, there are fundamental differences between Republicans and Democrats about the proper role of government - in terms of public investments, in terms of appropriate levels of regulation. There is a reason why major public investments in infrastructure, in bringing advanced manufacturing back to the US, etc., happened in the Biden administration while the Trump administration just talked about doing those things "next week." The difference is that one party believes that the federal government has a legitimate and necessary role to play in these areas, and the other party does not believe that. One party believes that the economic policies adopted since 1980, that have hollowed out the middle class and led to almost unprecedented disparity in wealth between a few Americans at the top and pretty much everybody else, are good policies that should be continued... and the other party believes that these policies are tearing our society apart. Saying there is "little substantive difference between them" suggests that you haven't really been paying attention.