What is going on with your backlinks?
How many content pages do you have?
Have you checked to make sure your content is still unique?
Why did you change your hosting?
How old is your website?
To be honest there are probably over a thousand different possible answers to your question. The more details you provide the better chance we can help point you in the right direction.
Thanks for your replay,
please find the answer.
1) I could see 144 backlinks (from 16 domains)
2) I have around 70 posts .
3) Yes all contents are unique.
4) I got one advice from one of the website says, your hosting server may be causing the problem . so that I changed my hosting.
5) around 2 year old.
Also this traffic drop has been happened with the time span of one day,Feb 28 th.
Two year old website and only 16 other websites think you are worthy of linking to. Your website has been up for over 700 days and you only have 70 posts? This appears to be less about a penalty and more about weak SEO.
If this was my website I would not worry about this traffic loss. I would worry more about growing my website.
I would want to build out more content to become the leader in my industry. Even if you are going after a small niche, you should be able to come up with more than 100 pages of valuable content. Look at all of your competitors for content ideas. Look at your customer emails for content ideas. Get creative for even more content ideas. Having so little content might be why so few websites are linking to you. If your content is great and valuable than do a better job promoting it so more websites link to you.
Over simplified answer - improve the value of your website by providing more & better content and attract more backlinks. Focus on the fundamentals of SEO to grow your business.
If you develop a great website that attracts many other relevant websites to link to you, you will not care about your Google rankings since you will be getting so much traffic from your non-Google sources.
Learned much also, from Goodroi's suggestions. You also may want to incorporate other methods of promoting your site. Do you have strong ads call to action tabs? What about social media and web commenting? Have you promoted your site via the powerful tools available to filter discussions about your brand and amplify your mission/message? Goodroi's point about Google rankings not being the only goal is spot on. Get out there and engage to build authentic audiences and a loyal customer base.
Your site has disappeared. Did you post the correct URL?
Forum TOS does not permit posting URLs or site specifics in this forum. It is not very unusual that new members haven't gotten familiar with reading TOS and Charters, that means it occasionally happens that URLs are removed.
Ah, now the URL makes sense.
firstly check website Internal linking and web page content if these are fine we stop the drop traffic.
If your site is 2 years old, and it was not hit by one of G's algo changes (Penguin, Panda, etc.) it just might be that your site has been scraped and another site is now ranking higher than you for your own content. Have you checked for exact phrases found on your site to see it others have copied it?
Tanor - That's exactly what happened to my site. The scrapers are ranking higher. I am now going through the list and filing DMCA reports. You'd think Google would be smart enough by now to be able to tell the original source of the content.
Firstly you have to check your backlinks they must be expired so renew them and also create new one add some new content and do seo according to your new content.