There could be multiple factors affecting your website ranking. One of the most important factors that could have affected your website would be 1) any technical change that had affected site speed 2) On page changes like Meta update, Headings Update, URL change, Media change etc.. 2) offsite change - backlinks gone spammy, removed or from non relevant sources 3) SSL / Hosting related issues - site kept going down for some reason 4) and last but not least the Google algorithm update. If issues persist you can reach out this top SEO company in Toronto for detailed audit of your website.
