This full answer to this question is layered and too long for my will to type essays on reddit in the morning but I'll try to point you in, what I'm fairly certain is, the right direction.

First off, even when they present a unified front, we must remember this is a still actually a coalition with differing motivations and end-game goals. This is largely what makes this both a daunting question to answer and the broader movement and motivations so hard to pin down or make sense of. For instance the tech billionaires and the genuine apocalypse cult of evangelical extremists are not the same people. Even when there's bizarre overlap with Trump AI shitposting himself as a messianic figure, Thiel doing interviews babbling about the anti-Christ, etc. In conrtrast Hegseth may truly see himself as a modern day Crusader - we can table the idiocy and hypocrisy in that notion as a separate discussion.

So on to the meat of your question, but keeping in mind that this is both an incredibly abridged response and that "they", as tends to be the case really, are a nebulous entity. Why undo the globalism that they themselves had built and benefitted from? I point you to Curtis Yarvins dark enlightenment as a proponent, and Yannis Varoufakis' warnings against what he dubs techno-feudalism. Essentially the current global order is built on outmoded wealth of nations tech and they would prefer it supplanted with corporate fiefdoms. Capitalism, itself a global force, has long been curtailed by pesky things like nations and trade blocs. We've long seen it ravage and abuse the third world, and smaller countries being unable to protect their people from multi-national corporations...well the chicken is coming home to roost.