I don't really know how this got 7 pages.
The cosmology of the weakest avatar of a single head of YHVH is multiversal+ (even a huge lowball considering Strange Journey), technically making every head a megaverse.
In Apocalypse we then see that there are thousand heads.
YHVH's own realm is outright called infinitely bigger than all of that and each of the 4 layers his realm consists of is infinitely larger than the lower layer.
The Diamond Realm then connects all that to even more shit. How large the Diamond Realm outside of the beforementioned stuff is, is speculation however.