I wouldn't count us out yet. Most of Ainz's real enemies never knew his full power and vastly underestimated him. Our characters however have a much firmer grasp of the power levels and can plan accordingly. Besides that, Ainz was able to 1v1 the Dominion Authority because like any classic fight against a wizard, it failed it's save and didn't make Ainz chew through his mana before fighting him. We however have a vast amount of decently levels characters on top of fighting in our own home turf, so while we might not have an advantage, it's at least not going to be a total stomp.

Hopefully.