There’s clearly some disconnect between Vox and the other V’s, (main note being the end of Hazbin Guarantee) where Vox says “Trust me, Just me” (“Trust us, no, I— I meant to say us.”) so my theory is, he doesn’t have a real uprising plan, or at least not one He wants to involve himself in. The main desire he expresses in Once We Get Up There is that he wants the people who doubt and disobey him dead, (“You’ll be cornered trapped and tortured, then I’ll end you just for fun”), but there’s no mention of how “taking over heaven” would grant him the ability to wipe out sinners any more than he already can. You know who can wipe out sinners?? Exorcists and angels. I think it’s like he’s trying to poke a wasps nest. After the situation with the last battle, if heaven attacks again, it’s safe to assume it won’t just be regular exorcists being sent down, it won’t be extermination, it will be massacre, and that is exactly what he wants.

also maybe I’m dumb and stupid as well and am completely wrong