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I know the recent Google update devalued a lot of low quality blogs, but i'm having a hard time understanding what can be considered low quality? My site is www.247VirtualAssistant.com and it wa sitting in the top 3 for all my keywords(virtual assistant, virtual assistants etc etc). Last month everything tanked and now on the 2nd and 3rd page for my keywords. I'm thinking this is because of a lot of my links got devalued but with my limited SEO knowledge, i'm having a hard time identifiyng these. Please help!

So i'm a beginner/intermediate SEO and uptil about 3 weeks ago i enjoyed Top 3 rankings for all my keywords(VIrtual Assistant,Virtual Assistants, Virtual Personal Assistant,Virtual Personal Assistants and so on) for my site www.247VirtualAssistant.com. All of a sudden i dropped in rankings and  can't figure out why. I ran a link analysis and nothing looks like it changed, in fact i still command much higher domain authority than my competition, but i'm stuck on the bottom of the 2nd page. I can't tell if i'm being penalized, if the other sites all of sudden just outperformed me or something else is happening here. I've also noticed a lot of "dancing" in my serps, I've been in 2nd last position on the 2nd page, then 1st of the third page, then last on the 2nd page and so on. Can someone please help me make sense of this?? Thanks! Thomas, a very confused an desperate website owner