I think this is a flawed assumption to begin with? There are smaller-government proponents across the political spectrum, for sure, but it certainly isn’t the default stance of most, or even many, people. On the further Left, especially, it’s a relatively smaller niche — many of the social programs in that agenda require effective democratic oversight and some degree of centralized planning and redistribution to function, at least before the pie-in-the-sky stateless communism phase. While there are various shades of anarcho-socialist, I’m pretty sure that isn’t the default stance for most of the US left.
And much of the MAGA agenda depends on outright fascism… government doesn’t get much “bigger” than that.
What we see today isn’t a public outcry for smaller government, but more responsive government, whether that’s MAGA eroding away the OG Republicans or the Progressives gnawing away at the centralist Democrats. Of course, what we got instead is corruption plus gaslighting 
These things don’t require a smaller government, but this:
There is so much that could in theory be done to provide more effective and responsive and democratic government, like:
- Reforming campaign finance, especially Citizens United
- Term limits for the Supreme Court and/or more seats
- Fairer nonpartisan district maps
- Plebiscites, yes, and also federal recalls
- National voting holidays and mandatory employer leave to vote
- Constitutional changes, especially in terms of the 1st Amendment, corporate speech, hate speech, etc.
- Electoral College reforms
- Better civics education
- Limiting foreign influence and money in lobbying
- Law enforcement reform
- Ballot reforms (e.g. parliamentary systems or ranked-choice)
etc.
Not saying any of those are right or wrong, but that there are many ways to change (and hopefully improve) government without simply shrinking it. The problem is that there is no realistic pathway to most of those because the two-party duopoly and campaign finance combined with private ownership of public media means that the entrenched footholds are so strong and so wealthy that there’s not a realistic pathway for challenging them at a grassroots level.
Anyway, I think one of the tragedies of American Exceptionalism is that a lot of our populace doesn’t know the difference between “big government” and “bad government”, having mostly never seen an effective government in their lives. Compared to most other rich countries, more Americans have never visited abroad, and the idea of government that “just works” is completely foreign to most of us.
Libertarianism as a significant political ideology is an American peculiarity; elsewhere in the developed world, people just aren’t as concerned about the size of government as opposed to what it’s doing and especially how well it’s doing it. Even the “Right” in much of the world is left of the US center-Left, especially in terms of their views of what the state should do: Americans, Western Europeans Differ on the Role of the State | Pew Research Center (in terms of providing for social welfare vs staying out of the way).
TLDR the argument we ought to be having is how to get better government, not smaller or bigger.