Ask every time
Customers who are happy with your work are usually glad to leave a review. They just forget, or they do not know how. Make the request part of finishing every job, not something you do when you remember.
Ask at the right moment
The best time is right after the work is done and the customer is pleased. A text with a direct link, sent that day, converts far better than an email a week later.
Make it one tap
Every extra step costs you reviews. Send a link that opens your Google review box directly. Do not ask people to search for your business.
Do not filter by stars
Some tools only show the Google link to people who rate you highly. Google calls that review gating and does not allow it. Ask for feedback first and offer the Google link to everyone.
Reply to every review
Thank people for good reviews and mention the job or the town. Replying shows future customers that you pay attention, and it adds relevant words to your profile.