I have been running a side project for a number of years, writing content of varying quality and changing permalinks multiple times over. I have approximately 150 articles. It has gotten to the point where I have been completely de-ranked after holding top spots for a number of keywords for a number of years. How my search traffic has reduced: The lack of experience in my earlier days has left me with nothing but 600+ links on Google that link through to 404s, and backlinks that also 404. I have no actions manual actions take against me. What should I do? Should I migrate my content and start afresh, forgetting my few backlinks? Should I set up 301 redirects for all my links? Should I revamp every post, and hope I can regain my previous ranks?