Broadly speaking, Accelerationism is the theory that you want to force some group / societal change / etc to speed up, to go faster.
The New Zealand Shooter, for example, wanted to push NZ to go even more cucked towards the Religion of Peace / authoritarian / anti-liberty, because he believes that eventually the population will snap and the blowback will be way harder. So he shot up the religion of peace knowing the left would fall over themselves in white guilt + they'd come for the Kiwi's guns. And they did.
Marxists often think they can use accelerationism on capitalism and cause it to collapse, not realizing that only shitty economic theories like Marxism fail like that.
In this election, accelerationism would be encouraging these idiots to try this ballot bullshit again in 2024, because the more they do the more obvious it becomes and the more likely they'll be caught. Or push Republicans to do the same thing, because the sure fire way to get the media to disavow a lefty tactic is to have a righty do it. (For example, Cernovich canceling a pedophile who worked for Disney.)