If your site is dropped ranking then you need to consider many of the things especially On page and off page. The main reason why your site dropped ranking is because of you don’t follow the google guidelines. What you need to do is consider web master guidelines first.
If you don’t create account in webmaster tools, first go and create the account to your website. Go an check the manual penalty. If any of the manual penalty occurred like “content spam”, “link spam” then you need to fix it immediately on your site and send recheck verification to google. If you can’t able to fix that they will not accept.
What you need to do is go and check your website about content and links. If any of the content is low quality or rubbish then you need to change that.
2nd is you are outranked by competitor. It is basically slight ranking drop you can easily fix this by improve the link quality of your website.
3rd is on page issue. What you need to do is go and check webmaster tools about your not found urls and fix that. You can create new post for that url and submit to google. This is how you can play safely.
4th is you side dropped ranking because of loss of backlinks. Huge drop is basically occurred due to this one reason. So, fix this by creating the new backlinks for that page.
Google flux and google update are other reason why your site dropped ranking. There are many seo companies out there to fix this problem. You can visit seo company in coimbatore to fix google droppings. They are experienced agency having more than 10+ years experience in SEO & digital marketing.