Why would there have been any more? The Istari were sent to inspire the populace to fight against Sauron, and the enemies of Sauron lived in Eriador, where the Five were sent. There wouldn't have been much of a point in sending any more Istari to other places because, for the most part, we don't know if any enemies of Sauron existed there.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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