Hi,Rajmi,
Yes, you should restart product submissions with a limit. You could further introduce a high point system for members who give a certain number of reviews in a week; that is, award members giving lots of reviews every week with more points.
With regard to the business/services category, I think you should introduce a category for travel booking firms/agencies [not online sites like yatra.com, but local centres].
Regars,
Vandana
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Faith gives us the courage to tackle the seemingly impossible, as well as the determination to see it through ~ Author Unknown
Regards,
vk