@Srinivasan, @Ms arora
What Mani said is this:
Organic traffic is basically traffic that you get when people type in your blog address on the browser, clicking links on other website (referrer) or from search engines like Google, Bing etc.
Social traiffc, is of course, traffic coming from social media like Facebook, linkedin, WhatsApp etc.
What he is trying to say is - check where have you faced the drop - in Organic or Social. For example, it is in Organic. Then drill down to channel where you faced a decline. Let's assume that you are getting less direct traffic (clicking links and direct access to the website etc.) than before. In that case, compare reports from the past and see what exaclty happened. Likewise if it is the lower traffic from search engine, then a lot more factors are at play.
Search Engines apply penaltities to the websites that do not comply with their guidelines. In specific, mobile searching. If your blog is not compatible with AMP, Google's mobile page view template, then the dip you see may be a direct result of Google focusing AMP enabled blogs than ones without it.
In essense, whatever analytics you are using, drill down and identify where you are seeing an impact. If it is everywhere, then you need to look at all places and figure out what you are doing wrong. Each case is different, and hence a single answer will not help.
I know this may sound complicated, however bear with me. This is the simpler part.