It's disingenuous to say Trump was a life-long Democrat. While I do agree that his policies would align more with a Democrat from the 90s than a modern Republican, I think it's more likely he was just taking the opposite party from the incumbent.
Well, maybe he was a lifelong Democrat, at heart. But that's certainly not what he was registered as.
Trumpism is cooked. So is MAGA, MIGA, or whatever new zio-psyop it tries to morph into. Trump knows it too. He's very social media savvy and well aware of what his former supporters are saying about him.
Trump doesn't care. The way he sees it, as long as he continues doing what Bibi tells him his financial future is secure.