I have a site thats working well, made some links here, some there, bought some guest posting... All my keywords were rising but suddenly my main keyword is sinking in one important particular country (.arg). In other regions still page 1. 2 weeks ago was page 1 position #3 and now its on page 4 while in the other countrys still perfect. What happened? Should I focus in build some links .com.ar? Thank you.