Hi. I am learning seo as I go. My website has only been live for 5 months and because I didn't have any experience, when I first started building backlinks, they were mostly forum signature backlinks and all of them were directed to my homepage. Dumb, I know. My question is, because my website's ranking has tumbled after the latest penguin update and I don't have thousands of backlinks to change, only a hundred or so, should I just leave all those backlinks that are pointing to my homepage alone and just build new diversified backlinks, or should I change all those forum signature backlinks and have them point to different pages of my website, or should I just delete them altogether? Also, most of those backlinks are on forums that have nothing to do with my niche.