Plug in SEO

I install this app in december 2019 , good for seo issues but very bad for rich snippets .All my product are with avertissement in the search console due to product model utilisation and review /rating .I ask to the support , they tell it is due to a google algo .we are in february 2020 , no support answer , no issues , and my serp position goes down .i think there are another application good