How to motivate a user to write an app review.
Ask the user to leave a review in exchange for some bonus or an invite for a friend (if it's a beta version).
You'll get a review and possibly a new user.
This option is more appropriate than automatically posting on social media that a new user has joined the app. When I see such an offer, I lose the desire to use this app. https://canhrau.com/wp-content/uploads/2022/04/nhung-hinh-anh-phong-canh-dep-nhat-hinh-17.png

You've got a real knack for explaining things! Ét o ét!  