Regardless of what platform you leave a review or testimonial, there are algorithms that can detect spam and fake reviews.
To ensure your reviews stick, make them more authentic. Ensure that if you are reviewing a company that is in another state/country, you make it relevant.
For example, if you leave a review for a cleaning company, say "I hired them to clean my rental property" This suggests that you don't live in the area that the company operates out of but you have an interest in the region.
Do you have any ideas or tricks that you have learned about reviews? Feel free to share them in the comments below!