First define “conservative”. Both that and “liberal” are grab-bag terms for a whole bunch of disparate ideas. And despite the apparent inevitability of how those grab bags are assembled, many countries have different mixtures of what they consider Left or Right, Liberal or Conservative vs the US standard mix.
Traditional conservative might embody any or all of: cultural stasis, men on top, Christianity to the fore, low taxes, light or nil regulation, white power, one dollar one vote, guns for all, big defense spending, forward deployments of troops, isolationism, aggressive countering of Communist regimes, minimal social spending (except maybe on the elderly), local control of schools, regressive taxation, minimal legal immigration, aggressive management of illegal immigration, rural power, suburban power, low wages for workers = high profits for businesses, knownothing-ism, low Federal deficits and borrowing, balanced budgets, favor incumbents over upstarts in business, low inflation, the gold standard, etc.
You’ll notice that within the grab bag, many of the items are contradictory.
Trumpism seems to stand mostly for “rules don’t apply to me, I have no concern for any person but myself, and aggressive whites waving guns are good.” I see a massive decline in local civility as more and more yahoos take their behavioral cues from Trump. Playing nice and following social convention or local law is for chumps, not winners! seems to be the main idea. knownothing-ism & naked male aggression are the two keywords.
The Republican party (different from conservatism) has always had the problem that if it’s all about empowering the wealthy and connected, that won’t attract enough votes. So they need to add some planks to their platform; ideally ones they can deliver cheaply, or better yet not deliver on until after the next election cycle.
Progressivism has a similar issue in that well-educated unselfish long-term thinking people are also a small minority. They need to attract more voters by delivering, or saying they’ll deliver, something of value to more selfish shorter-sighted folks. Whether the resulting Democratic platform can even be called small-p “progressive” is a darn good question.
In a sense, Trump & Trumpism has exposed the fault lines in the Republican party & platform. IMO the three factions are the wealthy / business elite, the social conservatives and racists (not synonyms), and the aggressive know-nothings. The latter two circles overlap some, but there’s a lot of disparity as well. The challenge for the latter two circles is there’s not really a lot the Federal government can deliver for them; their goals are truly mostly local. What the Feds can do for the latter groups is decline to intervene when local preferences get too troglodytic. Imagine how the South would look today if the Feds had simply ignored the 1960s civil rights movement or quashed it.