Since a lot of sellers in various niches seem to be impacted by that slump – I can only explain it with recession and companies cutting down. I see A LOT of top sellers with barely any orders in queue these days.
I do not believe that all these sellers got punished for a bad first buyer experience. Also: In some PRO categories, there aren't a lot of sellers – so a worse ranking should not tank sales THAT drastically.
What is interesting though, if you check Fiverr on SimilarWeb, you see their traffic is still very steady this year. In March, it actually increased from Feb by around 9%.
If everybody's impressions, messages and orders drop, you would expect the site is getting overall less traffic.
Curious to see how the traffic will look like for April.