Have you considered that Fiverr thinks that what you’re doing is enough for just X success score and if you don’t change anything you’re going to be stuck at this score forever or even go down while your competitors adapt? Have you tried to change something and see if your score will change too? The chat is monitored by AI… use that and communicate a little better, add more details, great and thank customers and try to avoid situations where the customer reaches out to ask how’s the project going.
Also let’s say that you have a 5day delivery, but you finish the project in 3 days… deliver it and slowly it will boost your delivery time to Very positive impact. I charge extra fee only for 24h guaranteed delivery.
I was stuck just like you at the start thinking I’m getting only 5* reviews, brilliant reviews and happy customers why isn’t my score changing?-Because I wasn’t changing.