Make It Fast And Easy
If it takes too long for a customer to leave a review, they probably won’t. So you need to have a way for them to leave a review as quickly as possible.
Every review platform should have a URL link that will take them directly to the place to leave a review. Keep this link in your phone and computer and have it ready to send to a customer at any moment.
Give the review link to your team of managers and salespeople since they are often with the customer at the end of the job.
Here's an example from inside of Google My Business, where they have a link that you can send to your customers.