Welcome to the Q&A Forum

And to expand on Kevin's answer.... results in whitehat SEO (i.e. following best practices) can sometimes take months before it really kicks in. We're working towards the long haul not the short game. Once you have all of your on-page/on-site stuff done, now's the time to start looking at relevant links, guest post opportunities, outreach, social media, etc. And then you can come back to the on-page/on-site stuff, see how  its been working, determine what else can be tweaked/fixed/changed, etc. and continually update your site(s) with new, fresh content on a regular basis. Lather, Rinse, Repeat.

Hi, Getting your URLs to be a little more "SEO friendly" (let's name it like that) is all about URL rewriting, which can be quite a headache if not implemented well. I have done this on a Wordpress website back a few years ago and kind of freaked out when I saw how many 404 errors I have got. The solution to avoid that is to implement URL rewriting and 301 redirects at the same time. My problem was that I had only done the URL rewriting, and have seen from Google Webmaster tools the erros, then I have started to search for a solution and I found that I need to redirect all my old URLs to the new destination. Then I have resubmitted a sitemap to Google and the problem was fixed. I hope you can learn from my experience. Good luck! Istvan