Couple months ago I ordered SEO service for 4 main keywords for my post. After backlinks started indexing some nice traffic start drive to my site from google. But after 2 weeks when almost all backlinks get indexed my site and all posts ranking dropped really deep in google search results. I think i get Sandboxed by google. And thats because I don't mixed my Backlinks only hard keywords was delivered. Is there solution for this without removing thees backlinks? If i make some generic anchor and naked urls backlinks to that same post does this will help?