I searched for the keyword "asian travel tips" and you were on the 3rd page of Google. I clicked and went to your website, so you should see at least one organic visit. Your site seemed to load pretty quickly, so that is good. Check the stats for today and let me know if the visit shows up. If you don't see it, there must be something wrong with your analytics tracking, which I feel must be the case because your visits dropped to zero. It just doesn't seem right that you wouldn't have at least a couple visits show up.

Have you been tracking some of your keywords daily with the rank tracker tool? That is a better way to get an update more often on your site's ranking for specific keywords since you can run it every day and see how the keywords have tracked over time rather than waiting for the weekly update.

I ran a site:www.travelnasia.com query and it looks like you've got 806 pages indexed in Google. Does that seem about right?

I scanned your site with Screaming Frog SEO Spider. It's a pretty nice tool, check it out if you haven't yet. It definitely helps with locating and fixing broken links. The tool also gives you access to tons of information about your site. Here are some sample reports from your site:
Crawl Overview: https://dl.dropboxusercontent.com/u/74533600/crawl_overview.xls
404 Errors: https://dl.dropboxusercontent.com/u/74533600/client_error_%284xx%29_inlinks.xls
No Response Links: https://dl.dropboxusercontent.com/u/74533600/no_response_inlinks.xls

Hopefully you're able to get this figured out quickly. I'll let you know if I think of anything else. Best of luck!

Have you checked your keyword rankings yet? Have they completely dropped off too? Hard to believe Google would completely drop your site overnight. Maybe there is an issue with your analytics tracking code being removed when you switched your website's theme. Are you seeing other traffic in GA?

Regardless, it looks like you've got a decent amount of broken links & 404 errors on your site. I doubt Google would kill your traffic over that, but it wouldn't hurt to fix these items so that once you're back online the Google Bot is not tripping over broken links.

Wow, 10 years ago EGOL! Must have been tough taking that approach back then when black-hat methods still worked pretty well. You were always in it for the long term I'm guessing.

From my experience I say user engagement does play a role. I have a page on my site that was never really optimized and doesn't have high page authority, but the user engagement is great. I get regular traffic to that page through quality keywords. If only I could get all my pages to perform like that. At the end of the day, I think focusing on engagement in addition to links & on-site optimization is worth the additional effort.

The Mozscape Index update yesterday includes even fewer urls, root domains, subdomains and total links than the previous Index from May 5th. You can compare the size of the Indexes on the Mozscape API Updates page. Most likely, you've built additional quality/relevant links as you have mentioned, but with the smaller Index these new links, and even previously indexed links, are not being picked up. Therefore, less links are being used to calculate your domain authority score. I would say the drop in your Domain Authority is due to the size of the index. Try checking out your competitor's sites to see if their domain authority dropped as well. I know mine went down slightly yesterday. You don't have anything to worry about, just keep earning quality links. I know it is tough to see your domain authority drop when you work hard to earn/build links, but the data used from one Index to the next has not been consistent, so don't worry too much about the increase/drop in domain authority from one index release to the next. If anything, track your domain authority over time and compare it to the size of the index to get a better idea of how your link building is performing. Unfortunately, that is the best answer I can give at this time.

I seem to have the same issue on my site. I get a sudden influx of visitors within minutes all coming from direct traffic. How did you discover the traffic was from Miami? The only identifying factor I could find in GA was that the Network Domain for the traffic was 1e100.net. Not sure how sending direct traffic would benefit a spammer.

Have you experienced an overall drop in traffic on days you get the huge spike in direct traffic? I feel like I do, maybe the high bounce rate is a problem and signal to Google?

Would be nice to block the traffic but possibly just filter it from GA to avoid skewed data if it is not affecting your site.

I've been using the Google Bot and it has been effective.

Seems like Google is leaning toward favoring YouTube content with the removal of Rich Snippets. If you can get the same SEO benefit using a video site map and embedding YouTube videos instead, why not have your website visitors increase your YouTube video view counts and possibly add subscribers while you're at it.