I want to add information. If you have received an order - give something to know the buyer within an hour and you will receive the maximum response rate. The following your messages within the order do not affect the ratings - from my own observation.
We all know that now, in order to get 2 level of the seller, you need to have a high level of Response Rate (more than 90%). How does the Fiverr count, which factors affect on it?