It would be helpful if you could share your gig. By the way, as you know, there are many reasons for a decrease in impressions for a gig. From my observation, if you initially receive impressions but lack clicks, messages, activity (offline), orders, have poor SEO (unoptimized keywords in the URL, title, and description), an unattractive gig image, or an unoptimized/unappealing description, it can result in decreasing impressions.
Solutions include - gig marketing, editing gigs (which involves using low-competition keywords in the title, description, and tags; if you're not getting enough clicks, you can try changing the gig image), and creating more gigs if you haven't already. Active orders and ongoing communication also boost impressions. I'm not an expert, but I've shared my opinion, hoping it will help you, bro.🙂