Gig came top but can't get orders

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Hi every one,
I’m a level, two sellers. In the last two months my gig was on page no 8-16, at that time I received more orders, this month and last month my gig come to the top, now it is on page no 1-3. unfortunately in this period, I couldn’t get more orders. sometimes the order was decreased a high amount. I can’t understand what happened. anyone can have this experience please help me. Thanks