Site's traffic decline by 60% overnight. Please help

Hello everyone,

Since 20th September 2017, my site's traffic has declined steadily by 60%. The site is authoritative and has only seen upwards growth for last 3-4 years of its existence. We have never had any issue with Google ranking, we produce quality content regularly and has never done any SEO on the site, beside the natural links we received.

We are infinitely grateful to Google for its services, for sending us traffic and helping monetize the site. We truly are.

Everything was alright, but then, since 20th September, our site's traffic has suddenly started declining. No, nothing major has been done on our side this month, no theme changes or Google policy infringements. None.

Could anyone please help us determine what's wrong? If this is some update hurting us, why did not us for the last 4 years? If this is manual, why we received no manual actions notification in Webmaster Tools. Please, someone, help us.

This is the site: softstribe.com

Can you please help us rectify any mistakes if there are any?

Thank you.

I'm sorry man. Maybe one of your competitors benchmarked you and is outranking you by far :/ At least if you are not blacklisted by search engines it's hard to imagine something else.

I assume you've checked for lost or broken backlinks? Otherwise like Toal5760 said, maybe a competitor has shadowed you.

so, you monitor your most importan results? Or just play in G anylitcs all day?

Hello,
Do you monitor your keyword rankings at all?
Do you get most of your traffic from google?