Since, we have added around 120 articles with good content and pages, we have seen some lagging in page loading speed and it blocking us in rank improving. So decided to go back to basics and find out why its happening.
After, analyzing GT Metrix and GSA checking, we found widgets in home page is making the site slow and loads every time we refresh the site. So we decided to change the home page layout as Grid with boxes for all articles.
We achieved GTMetrix score - 82 from Previous was D- 47.
Now both mobile and desktop, performance is good for our readers. Target achieved. :)