help me to fix some error in my website

Job ID: 36740871

Budget: ₹600 – ₹700 INR

hii, am shiv from india. i have a 3 month old website on wordpress with a premium hosting plan , i have posted 40+ will optimisezd seo posts on it with proper seo.many of them are also ranked in top 10 positions also.
In 1st two month i am getting a pretty good impression and clicks but suddenly from last 15 days my all impression and clicks are sudden disappear. all posts are indexed but they are de-ranked and am unable to find by searching the keyword.
i have checked all issue such as :no plagrism, checked speed insite shows 100 in both pc and mobile, all pages are indexed, no manual acction, no security issue, no 404 or broken links error you can also check some attached screenshots.
if you can help me to solve and find out why all of sudden my all posts are deranked and why zero impression and click you can contact me. am a college student and i have invest lot of money for starting this website by savings pocket money i cant offer you a lot of money please help.