> This caused many accounts to "lose value" and thus rank lower on searches
wouldn't this make some other accounts rank higher on searches then? I mean it couldn't have been a problem that affected absolutely everyone so for someone it must've been a positive change.
I assume it did not affect everyone indeed. However, a lot of "Top Rated" sellers, who were raking in good amounts of money saw their income fall drastically, while still providing the same quality of work. The only thing that changed was their Success Score being lower.
It's very hard to improve a metric when you don't know what are the criteria affecting the metric. I've reached out to Fiverr regaring this and they never bothered to tell anyone what impacted your Success Score. "Just do better", they told me.