You have four or more tags per post. And all of them are Index and Follow. This means, every post title is being indexed 4 times. I think that counts as duplicate content.
Secondly, have you enabled Meta keywords in yoast?
name=“keywords” content="Paytm Mall Offers, Paytm Mall Coupons, Paytm Mall Promo Code, Paytm Mall Coupon Code, Paytmmall Offers
In your place, i would keep 1 or 2 tags on a page, or index category instead of tag. And i would stop putting meta keywords for each article. Meta keywords have no positive affect on SEO but they have more negative effects. Possibly it can be categorized as keyword stuffing.
Use this plugin to know your keyword density. If its too hgih, then that can be the problem. Its an old plugin but very effective.