Gig not ranked

[mdimran17]

My best-selling gig which has 130 reviews. And I have completed more than 200 orders already . But last 6 months it's not ranked and didn't get any single order from new client .So how can I get a new order in this situation? Yeah, I know Sometimes I can't deliver my work properly or my client doesn't like my work, but that doesn't mean I am not capable for new work ?

What type of ranking system is this on fiverr?  

If no new opportunities come my way, how can I prove that I am capable of doing the work? In this situation, I feel like I can't do anything.  But if I couldn't work, how did I manage to complete so many tasks before?

Do you have any suggestions for me in this situation ?

Thanks All