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As per my opinion here i never work for SEs. if i want rank high with my site then i keep in mind about good User experience. of course i will target keywords to rank my site well, i will add a content that can be useful and interesting to my targeted audience and build some natural links, and keep update my site. for your last question about website structure i have a good article here https://blog.kissmetrics.com/site-structure-enhance-seo/
I did found the same issue for my site last months. the issue was my referral traffic and some organic (spam keywords) traffic was drastically increased by spam traffic that make 90% to 100% bounce rate. Check out your referral traffic and organic, this can be the issue too.
I found your site in WordPress, check all your plugins and theme is up to date, i found some interesting articles that can help you. https://aw-snap.info/articles/spam-hack-wordpress.php and https://googlewebmastercentral.blogspot.in/2008/04/my-sites-been-hacked-now-what.html
or you can request google a review for you site https://support.google.com/webmasters/answer/168328?hl=en
Hope it helps 
Hi, as per my experience i see that Google take time to clear the error message for structured data, some times 15 to 20 days.. i think you need to wait for some days, if testing tool saying it is correct then it may not have any error now. you can fetch the error pages in Google search console for possibly fast crawling.
Totally Agreed... webmaster tool (now search console) gives the functionality to tell google about your site updates instantly using Fetch facility in the tool, so you can index your site's new or updated content as well you can find the errors on your web pages like crawl errors, indexing errors, and more.
you can see the manual action as well if your site spreading spam on internet. and after fixing the issues you can send reconsideration request also. so, it is a big benefit for verified site in Google webmaster tool.
Hi there, are you getting Spam traffic? this can be a big reason to increase bounce rate in analytic, if yes then this is read the following articles it may help you to stop spam traffic and reduce bounce rate...
https://moz.com/blog/how-to-stop-spam-bots-from-ruining-your-analytics-referral-data
http://www.ohow.co/unusual-increase-in-direct-traffic-on-ga-spam/
No, it won't create any confusion for SEs if you are using the schema in proper manner like mentioned here, as per my opinion Structured data is a great idea to display your business in SEs, and it is definitely appreciated by SEs. This is also a good article about Schema https://blog.kissmetrics.com/get-started-using-schema/
Hope it helps
Yes, I have done for most of my sites manually but after reading this article I found some interesting points like i need to use Structured data markup helper.
Thank you both for your response.
@Martijn your robots.txt is really a nice example but for my new site is it good practice to block this areas??
@Peter To be a safe side I was using the same robots.txt...
I have a WordPress site as using theme Genesis i am using default robots.txt. that has a line Allow: /wp-admin/admin-ajax.php, is it okay or any problem. Should i change it?
Hi there, are you getting Spam traffic? this can be a big reason to increase bounce rate in analytic, if yes then this is read the following articles it may help you to stop spam traffic and reduce bounce rate...
https://moz.com/blog/how-to-stop-spam-bots-from-ruining-your-analytics-referral-data
http://www.ohow.co/unusual-increase-in-direct-traffic-on-ga-spam/
Yes, I have done for most of my sites manually but after reading this article I found some interesting points like i need to use Structured data markup helper.
Hi,
Creating robots.txt file for the site is one of the most important thing, you need to understand your website or stores basic needs what to keep private and what to make public; I think you need to block some part in your magento site like your search pages (?*sid) and admin pages, user dashboard pages, here is an example links Robots.txt for Magento and Robots.txt File Examples
I have never seen or even heard that google penalize any site for Bold, Italic or underline. It is okay to use B.I.U with your content but as per my opinion you need not to B.I.U every keyword. you just need to write content for Users not for Search Engines, just B.I.U the words that should be highlighted on your content.
for Ex. if you are writing content for your product then highlight its Main functionalities. Hope it helps...
Yes, this is called Shared web hosting service. let me give you a link
No, it won't create any confusion for SEs if you are using the schema in proper manner like mentioned here, as per my opinion Structured data is a great idea to display your business in SEs, and it is definitely appreciated by SEs. This is also a good article about Schema https://blog.kissmetrics.com/get-started-using-schema/
Hope it helps
Hi, as per my experience i see that Google take time to clear the error message for structured data, some times 15 to 20 days.. i think you need to wait for some days, if testing tool saying it is correct then it may not have any error now. you can fetch the error pages in Google search console for possibly fast crawling.
All the options for fetch in Google search console has a different purposes
Desktop - This is default and this option is for the website which can crawl images, videos, webpages and all that.
Mobile smartphone - This option is for Google smartphone crawlers.
Mobile xHTML - This option does not support rendering and Uses the SAMSUNG XHTML/WML crawler.
Mobile cHTML - This option is mostly for the Japanese feature phones which Uses the DoCoMo Google Mobile crawler and this option also does not support rendering.
Source here