The right are very good at social media, and have the ability to get a LOT of people behind the latest talking point and bombard all channels with content.
Take the recent 'they're eating the swans' nonsense. When that came out, it was backed with a range of AI generated memes, a video clip from a TV show some 10-12 years ago, and then a clip of someone carrying a swan over a bridge - which quickly spread as evidence that migrants were just picking up swans to eat them (it was a clip of someone saving a swan from a busy road to return it to a river/lake or whatever).
All of this was debunked within a matter of days, but not before it had gone absolutely crazy viral and even got the attention of the likes of Elon who then ensures that almost every X user gets to see it (I am always getting notifications from him, even though I don't follow him).
The other parties simply can't compete with things like this. It's organised. They come up with a talking point and make sure they have the content in place, and the necessary means to share with all the right influencers, bats**t conspiracy theorists, their bot network and more.
It all helps them to promote themselves as the 'silent majority' and make people think most people are backing Reform, which then makes other people who might be a little more open minded think it's actually okay to share the same views.
The crazy racist that was ignored in the pub is now able to gain followers online and feel relevant for once. They're part of something big and it's okay to be racist and shout it from the rooftops (or a statue in Trafalgar Square or something).