Unfortunately, there's no magic formula for collecting a maximum number of customer reviews. Around 1 in 3 customers leave a review.
Some very satisfied customers won't take the time to leave a review, and others who are only moderately satisfied won't leave a comment to avoid damaging the professional's reputation. It happens, there are no rules! But on the whole, for the volume of services you provide, the trend in reviews left will be in line with the quality of your services.
In any case, reviews are valuable and constructive. After a service, customers receive an email from Wecasa encouraging them to rate the professional. They are then free to do so. The best way to get a good review is to provide an excellent service.