Very Hyperactive hamster

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Hi I've had my first ever hamster a Syrian for 6 months now, a week ago I upgraded his cage from a savic hamster heaven cage to a rat cage double the size to fit in a bigger wheel. However my hamster is now extremely agitated, constantly running around in circles, biting the cage bars, excessive grooming and trying to escape. I used all same toys and mixed in old bedding to keep his scent. I've tried adding more things for him to hide in I just don't know what to do, incredibly upsetting seeing him this way, feel like I'm a terrible owner