Yep. I'm kinda stuck right now, because there is going to be a civilization and all that, but at the same time Xavanos can't just go 'ok lol yu guys can stay here jk about the hole destroying u thing'.
Then you really should have thought of that before making a god with no variability or compatibility whatsoever.
However, because I'm nice, I'll point out one obvious escape route- become corrupted. No, I don't mean go insane and start loving puppies, I mean start making concessions to practicality and in doing so lose your roots.
You know that, on your own, you can't defeat every other god and their creations. They're growing while you're just staying the same; they can create and gain, you can only try to stop losing ground. In an extreme case, this could be an epiphany all on its own- Void can't beat existence after all.
As a less severe form, though, you could just make temporary concessions. Alright, you can't kill every other god at once. Okay, you can't annihilate all creation with no creations of your own. So you start temporarily doing things you need to do- allying with or at least no longer openly and constantly antagonizing some gods, making creations that will help you destroy everything and then themselves, and so on.
So then that keeps happening. Maybe you just keep needing more power, because let's face it, even creating voidspawn and going against another deity 1v1, you're probably not going to be as powerful as you need to be to do what you want to do. Maybe you'll genuinely start liking your creations and opportunities more than sitting in a blank space existing. Maybe you'll realize that your definition of Void is heavily, heavily dependent on creation to have meaning, seeing as it's not just blankness, it's anti-anything, and that has no meaning if there isn't anything.
But whatever the reason, you stop being the god of annihilating everything utterly and returning to a state of perfect Void, because whether you acknowledge it openly or not, that's not what you want anymore, or at a
bare minimum, that's not what you want for a long, long time.
You then go on to make nihilistic sadist cults and become a god of loss, suffering, destruction, or some other concepts that aren't literally just boring incarnate. And next time you make a character, you can think about what would make them interesting and not just antagonistic, particularly in how they interact with other characters.