some days before i cancel 2 orders by mutual cancelation due to which my order completion rate goes down .and now i am not getting order.this problem arise due to order cancelation or any other reason
That could very well be part of the reason, yes. The Fiverr search listings are performance-based, and when a stat like order completion drops below 90%, the seems to tell the system that you are not good at completing your orders. I recommend completing your future orders, and doing what you can NOT to cancel them so that your order completion rating can rise over time.
An 82% order cancellation rating is not good.