Accelerationism is that the current neoliberalism order will "naturally" progress to a next phase of society.
I gather that left-accelerationists (L/acc) usually subscribe to the labor theory of value, and so automation's decrease of labor value to 0 will result in a collapse of capitalism that derives value of goods and services from the labor needed to produce them.
Right-accelerationism (R/acc) seeks to embrace the disruption of technology to a logical extreme for technologial progress. Neo-Reaction (NRx) wants to revert back to pre-democratic ideals as they see democracy as being incompatible with their techno-libertarian ideals.
I haven't heard of xenoaccelerationism (X/acc?) before but upon a cursory glance, it seems similar in that it embraces the disruption of culture and identity politics by technology's increasing encroachment and control on nature. It sounds like an overlap with transhumanism, but I am probably uninformed about the finer details.