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Ian I don't think anyone is going to be able to help you without being able to see your site, do some checking around the SERPs, etc... If you don't want to provide that information, we understand, but I don't think anyone could provide you with a useful answer. As far as new sites going up and then dropping down in the first few months, we used to call this the "Google Sandbox effect". Nobody talks about it anymore for various reasons, but many of us believe that there is still an amount of time for a new site where Google will give it the benefit of a doubt in order to collect metrics about it from the SERPs, such as user's reactions to it appearing in the search results for different queries. Once that data is crunched the rankings often go down. That's just a theory, but I thought I'd throw it out there. It doesn't seem to make sense in this case though, as it doesn't explain the Moz metric drops, which are not associated with Google at all. Google recently cleaned house a bit on structured data in the SERPs, which might explain that part of it. Even if your data markup was using the correct syntax it wouldn't help if you don't have the trust metrics necessary for Google to deem the sight worthy of structured data in the SERPs.

I am working on an Online Digital Marketing Magazine and many times I am explaining a concept or something about marketing. If I am talking about Topic "A" and I explain what it means and why it is important, I like embolden the topic I am explaining and put the explanation in italics. In my view, this is for the purpose of skimming the article to pick out the more important parts. Additionally, since the topics being explained are the targeted keywords I figured it would add to SEO, I just hope it doesn't hurt rankings but the ever looming over-optimizing threat. Not sure on any quantitative limits on bold and italicized text but would love to see some numbers on this topic. I guess I am approaching this with a usability and reader perspective but everyone is different, and I know someone will look at the article and be like oh no why!>? Please let me know if you think this way or a good reason to stop thinking this way. yzJ18D2.png

Great video too... Highly recommend

Thank you mrcensorious, That makes sense and should be pretty easy to do. Thanks for your time.