Hi i am new seller here ! 
I have two gigs. One with 8 reviews with BEST SELLER status and other is 0 review. I am very curious to know about it. 
Is it possible to change automatically BEST SELLER status to the new gig when i get reviews a lot ? I mean is there any option like that fiverr has ?
Hi there,
Welcome to the community
That feature is automatic and there’s no way to change that by yourself.
Thank you
I am not totally clear. 
will it change when my other gig gets more review ?
Sure! So the ‘BEST SELLER’ gig is actually not the one that has more reviews, but the most active one.
So my current best seller gig has less reviews than another but it’s more popular now and has the ‘Best Seller’ status on it
Thank you very much. I am totally clear about this now. I can work properly.