Because of the way our elections work, 51% being the winner, both parties are big tent organizations. Whereas the core of each party is, about 35% liberals for the Dems and 22% conservatives for the Republicans. So, in order to win an election, a politician has to appeal to enough of the people who are not natural members of their party to turn the stomachs of those people who are natural members. This creates a lot of difficulties for those politicians who are conservative as they must appeal to people many in their 22%, or so, (give 0r take) would like to shoot, shovel and shut up about. That’s just the nature of the beast.
According to this categorization (one of many, and probably not the best) you could say that MAGA and Trump drew strong support from Country First Republicans. He won the Core Conservatives and the populist Market Skeptic Republicans, with some defections. That's not enough to get elected. You'd have to win some support among the more free market and globalist New Era Enterprisers, the independent Bystanders and among dissatisfied Democrats.