Learn how to create a proper Tripadvisor review link so that your customer lands directly on your Tripadvisor review page. Creating a link that arrives directly on the star selection screen greatly increases your chances of receiving a review.
Always ask the customer at the end of the job: "Would you mind if I send you a request for feedback on how I did today?".
Be sure to spell your customers name correctly and with the correct capitalization (IE. Susan Geoffrey NOT susan jeffrey).
Sending your review request as soon as possible while the great experience is still fresh in the customers mind.