Hi, I am coaching fiverr since 2 years, I have seen many cases like that.
I can sort out your problem into 3 sections which I am writing below, hopefully you will get your answer.
Problem1: "We are getting impressions but no clicks"
Solution: work on your title and gig image
Problem2: "We are getting impressions and clicks but buyer don't contact"
Solution: Make changes in your gig description, make it clear (no confusing text) Use one price means one package, in many cases I found the price packages were confusing and buyers come to gig and don't understand which package is suitable for their need.
Problem3: "We are getting impressions, clicks and also contacted by buyer but no orders"
Solution: It means you have to be matured in your communication level, and you have to become master in your skills. You are not doing what you are selling mean what you have promised in your gig that you are not doing as per your words. For instance if you have written that you will provide a vector logo file and when the buyer come to you in your inbox then you fails to show him anything like what you have promised.