Gamemaster's Adventures in another world

It's your typical "I got transfer to another world by death or some virtual reality game," but this time it's the Gamemaster who gets transferred to another world. Fortunately, he gets to keep his powers.

(Think of this like light novel, The New Gate.)

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Verden Kyler is a gamemaster of a Game Master in a virutal world called Avant-Garde’s Mirror Sky. For unknown reason, he's been transported to another world that appears to be Avant-Garde’s Mirror Sky, but thirty years have passed and the players who once roam the world are considered distance legends.

Fortunately, Verden gets to keep his powers as a Game Master only unrestricted now. What shall he do?