My Site went from 1st # to 17# for Earn Money Course

My Site hcqe.com went from 1st position to 2nd page (17#), few days back for Earn Money Course keyword when nothing was changed. Not even backlinks. Of course, I did not promote my website for few months. But this was the case in previous month when I lost my position. Can anybody tell me why is it so? I do not have answer for this question. I checked competitors also. But nothing was changed to their websites or bls.

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