I have had the exact same thing happen. From $8,000+ a month to not even $2,000 in July. And I had a 2-star review a few months ago. It is hard to believe that Fiverr lets one bad apple destroy your standings in its algorithm, but that appears to be the case and their customer support has zero power to change it, talk about it, or explain it. My May earnings rebounded because I contacted every single person I had worked for previously to see if they had anything for me, but my number of new inquiries - excepting those from India, Pakistan and Nigeria that usually say "give me work" are almost nil.