Looks like a whole army of us are having this problem.
I can understand a little tweak to an algorithm which may negatively impact some sellers. But this is a CLEAR screw up from Fiverr, where countless people with clearly excellent track records with excellent clients are being punished. I am trying to boost myself back up to success score of 7, but no matter how many 5 star reviews I get, it doesn't budge.
I bet Fiverr is relying on private reviews to judge this - they just need to be open about it. - Because it is IMPOSSIBLE to correct something that is vague. They're telling me "client satisfaction" is low, even though my reviews are excellent in the vast majority.
If you work at Fiverr, please fix this.