It's true, the Left can't meme.
But the Right sucks at every other form of entertainment.
The issue I think is fundamentally structural- Cluster B socjus warriors really believe in what they believe in and back that belief in emotional vitrol. This allows them to endlessly work towards their goals of institutional capture (which in itself is really quite boring of a process). They want those institutional positions and are willing to sit through those boring meetings in order to implement their goals. This has allowed them to progressively capture an institution every generation, starting with education, then culture/entertainment, then cities, and finally state and federal government.
Secondly, most people are not disagreeable enough to fight through an endless stream of socjus vitrol (i.e. cancellation, doxxing, violence). They're willing to stay quiet if they won't suffer, and that really only leaves a few individuals who are either inexhaustible in their beliefs or who love the fight to go up against them (i.e. Trump).
Traditional liberalism as a state-of-being doesn't really lend itself as strongly as the utopia of the left, as people are already 'raised in it'. They benefit from it, but it elicits relatively little emotion- as such, they also don't see how green the grass really is on their side of the fence, while the utopia of the left promises even greener grass.
Simultaneously, Western Nationalism has been systematically demolished throughout the last 40 years, with an almost-fatal blow coming from the Forever Wars in the Middle East (Patriotism discredited), and a second blow coming from the 2008 Recession (Capitalism discredited). Same could be said about the Church as an institution- having lost its position within the last 20 years or so.
I can see some parallels to the tired institutions of Late Imperial Rome, and the rapid rise of Christianity, though obviously in darker tones today- there is neither forgiveness nor salvation in this modern cult of equity.