I have a blog that used to get 300K+ UVs every month, but was later manually penalized due to unnatural links. The penalty was lifted a few years ago, but the traffic never recovered; now receives around 30K UVs a month. I am planning to completely restructure the website and start working on it again. Do you think I can get it back to where it was once considering there are no penalties on it right now, or should I dump it and start afresh because it has been manually penalized once?