I don’t see how this would apply to the OP’s proofreading and editing gig. I think this might only apply to art/design gigs.
The most impressionable way, in my opinion, of leaving a good first impression is by delivering products/rendering services that are of impeccable quality.
Also, please bear in mind that reviews are only optional, and you cannot force the buyer to post a review after order completion. I understand that reviews are very important, especially for a new seller. But there’s nothing you can do if your buyer doesn’t want to post a review (I’d say the average number of rated reviews is between 65% and 85%) as asking your buyer to post a review can get you a ToS warning (there are many posts on this topic on the forum).
I suggest that you do as @lloydsolutions said as not doing so can get your account a ToS warning, and we wouldn’t want to see your account getting in trouble.