Ever since Neoliberalism became dominat amongst mainstream "center" large parties in the West:

• Inequality has explode.
• Social Mobility has collapsed.
• The super-wealthy who are behind all of it because they paid the mainstream politicians to reduce their taxes, to have the State stop controlling, shapping or in any way participating in even the provision of life's essentials (most notably housing), to enact policies that support big asset owners all paid for with austerity for those who income mainly comes from their work and to remove any and all oversight over money making activities, have been heavilly funding political parties that blame the consequences for the many (especially those at the lowest end of the wealth ladder) of all that on foreigners ("immigrants", "foreign interference") as well as News companies to parrot such ideas.

I mean, the first two things could also have made the (non-center, non-mainstream) leftwing grow, but unlike the far-right the people who have most of the wealth aren't funding parties fighting for more equality or buying newspapers to have them spreading the idea that we should tax the rich more to pay for universal healthcare and high quality education for free or that the democratically elected state should have greater oversight over and participation in the provision of life's essentials such as housing, so the left only ever advances amongst the well-informed and politically aware, not amongst whose beliefs come tabloid headlines, privatelly owned "news" channels and loudmouth "influencers" who make money from ragebaiting and reinforcing those views.

There are a few little leftwing victories here and there (the recent win of Die Linke in Berlin's municipal elections, Mamdani's election as Mayor of New York and so on), but almost all of the money and pretty much all the propaganda that passes for News nowadays is pushing rightwings views so of which being pretty much Fascist views.