Wow, how did you manage to be in the top of Google almost from the very beginning? I thought that this would require a very good SEO promotion strategy and a long time. Are you not the owner, but just have some position in this company? I think you should consult with SEO specialists who can help you get your positions back. I turn to Rankulate from time to time for SEO issues, they solved my problem with indexing product pages for me and that’s why I trust them in this matter. I think you should first analyze your competitors and publish more quality content, maybe this will help you get your positions back in the top of Google.