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Hello,  To the best of my knowledge, and based on my personal experience, I have seen google at times throw my page to 2nd and 3rd and even beyond! Do not panic. I would recommend looking at on-page optimization first to check your content and make sure it is relevant and easy to read and understand without too many keyword stuffing in it. check out this link as well https://yoast.com/ranking-signals/, it might help.  Give it some time and see if there's any change. Good luck!