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.
If the fascists truly believed your votes don't/won't count in the future, they wouldn't be working so hard to take away voting rights.
I think we're dangerously close to a point where voting won't matter, but we're not there yet. Look at the Wisconsin Supreme Court race a few weeks ago. Elon Musk got involved and personally spent more than $25 million to try to buy the race. He was directly paying off voters to vote for the Republican. There was nearly $100 million spent on the race, an overwhelming majority of which was spent by/for the Republican.
Yet the Democrat won with like 10 percentage points more of the vote. She blew the Musk funded fascist out of the water. It wasn't even close.
If voting really didn't matter at all, do you really think that would have been the outcome?
If voting really didn't matter at all, would they be actively trying to strip voting rights away from women right now?
Don't fall for the fascist propaganda. Voting still matters. It's not the only thing that matters. We should all be way more engaged in politics than merely voting. But voting still matters, too.