Snippet not work for my article in google

[JackJasonn]

I add the script for star snippet in my website but not work in my posts

you can see it in this URL https://youtech.ooo/showbox-apk-download/

when I searched in google my custom keyword "Showbox" my competitor show with star snippet in SERP but my site doesn't show snippet stars.

Thank You!

[DarinPirkey]

For the page I see schema for FAQPage and SoftwareApplication among others.  But I don't see product review schema.