So there's two factors that gave Trump (barely) the election (all the battleground states were narrowly chosen)

One, I speculate and no one seems to be addressing, is the trillion-dollar far-right propaganda machine. FOX News, OANN, Michael Walsh, Ben Shapiro, Joe Rogan and so on. It's continuously pumping content out to the population telling them that liberals are all communists and women should all be tradwives. Also that everyone nonwhite or poor is a leech on the economy.

The other is the King Log vs. King Stork thing. In those industrialized nations where the left-side party is neoliberal (preserves the status quo), the far right parties get strong support. It was happening across Europe around when Trump got elected, though there's been a left-side push-back since, possibly due to Trump providing a visible example of who they don't want in office. Canada's economist / banker PM was elected due to Trump, we are pretty sure.

Biden was as right wing as they come in the Democratic party, and for 2020 the party's principals (who get their own votes) chose him, deciding that everyone else was too socialist for them. Biden was Biden (that is, an establishment neoliberal) with some efforts to appeal to the public. And then in 2024 he pulled out of the race, and Harris took over and in the last few months of campaigning appealed to less-nazi Republicans, which alienated her base.

The election was won by MAGA disciples voting only top ballot (for Trump and nothing else) and lost by low-information Democrats who weren't motivated or decided to send a message by failing to show.

Regardless, figuring out how he won is more important than figuring out how to get rid of him, because even if he dies, the GOP is going to churn out Secret Hitler after Secret Hitler, and the Democratic party, determined not to go left, is going to fall into irrelevance, just before they are imprisoned / killed as political enemies.