There's really nothing he can do about it at this point short of completely disappearing from the public eye. He's so thoroughly fucked his reputation that anything associated with him is fucked by extension.
Even if he completely leaves any interaction with politics at all, he still has SpaceX, Twitter, and Tesla that will all maintain his status as a public figure. He's not going to de-Nazify twitter. Telsas aren't going to suddenly become good cars without a reputation of being swastikcars.
The only way he could stop being bullied by "the left" is if he sold off every company he owns and disappeared into obscurity. Even then, he'll still get roasted online all the time. But if he avoids social media he could probably ignore it.
But that would all go directly against his nature. So there's nothing he realistically would do that could get "the left" to stop being mean to him. It's the rest of his miserable life.
Could you imagine what language would look like 10-15 years from now if this actually took off.
Like, think of how ubiquitous stuff like 'unalive' or 'seggs' has become after just a few years trying to avoid algorithmic censors. Now imagine that for 5 years most people all over the internet were just inserting random phrases into their sentences. I have no idea where that would go, but it would make our colloquial language absolutely wild.