Hello. I have a tech blog and until now I used to rank some easy low competition keywords with no backlinks. I managed to rank them on 2nd and 3rd page on google. But for a month now I noticed that I couldn't do that anymore. Google now ranks me on 13th 14th page for the same competition level keywords. Could this be a penalty? I mention that my other keywords keep their good and stable SERPS. Thank you!