Does my Site Have a Google Penalty?
First do your research. Do you find any pages losing rankings abruptly or disappearing from the index without you changing anything? Have you checked the Search Console for any messages indicating a manual action taken from Google? Have you bought any SEO gigs recently? Backlinks, blog comments, forum profiles, bookmarks, guest posts, exchanged any links? All the above in large quantities can trigger an automatic penalty. Have you changed your website content or sold any links from your articles? If none of the above, then something's changed in the engine, and you've been affected. The best thing to do is go through the recent Google updates for any hints or seek professional help. It's not a matter to neglect as it may never go away and you can't afford losing business.