There was a helpful topic by @Speedy876 titled “How to Keep Orders Under Control” and a feature of LIMITING ORDERS IN QUEUE" was mentioned by @fastcopywriter. So for all those who still are unable to find thi feature, please see the screenshot.
All you need to do is goto your gigs and click on a gig to open its statistics (do not go edit gig page, just click on the gig).
P.S: this feature is not only for Super sellers, I am myslef a level 2 seller.
Goodluck, Hope you get so many orders so that you use this feature