Here's my hot take: people aren't switching to far right parties all that much. In a moderately healthy democracy, up to 30% of voters are often protest voters. They are unsatisfied with the current state of affairs and vote for whoever promises the largest upset of the status quo that they could see as potentially benefitting them.

Often the media then likes to massively overinflate their popularity, artificially enhancing their electoral success. But it's also often short-lived. If you look at Dutch elections, you'll find that a group of voters went for LPF, then PVV, then FvD and then PVV again. Each time it's broadly talked about as the "rise of X party" but almost every time nothing truly materializes.

In the US you see a hardcore group of approx. 30% of voters vote for Trump religiously. Then there's a smaller group of moderate Republicans that dislike the Democrats enough to end up voting for Trump too. They don't like Trump but he's "ok enough, and better than Obama/Clinton/Biden/Sanders etc...".

In France, Le Pen got around 30% of the vote. She didn't perform dissimilarly to the last presidential election results, it was more noticeable that the other parties got much smaller than they were. But whether or not Le Pen can actually take the crown remains to be seen.