I remember reading that Overlord is planned to be 18 volumes total, and it's "simply the prologue". Maruyama has stated he'll write more if he feels there's more to write.
Personally, I think it's an interesting idea to set Overlord as a "prologue" to Ainz's rise into power and a sequel novel series will follow which may not have Nazarick as the main focus but maybe as more of an antagonist.
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