The fact that you do not advertise is commendable (two hands clapping!)
Kayak Online Marketing doesn't advertise either, save for an experiment we conducted about 18 months ago when I invested $20 (+$50 promo from Google) on an AdWords campaign and earned roughly $12,000 from it inside of a week. A lot of readers are likely wondering why I stopped spending on PPC... the answer is that great content marketing has made that $12k look like a child's pocket change. Besides, we truly believe in "attracting" customers with great content over "interrupting" them with sales pitches.
You mentioned you follow Zen-like practices, but that it "ain't working" any more... On a hunch, I visited your website. There is certainly a lot there, including a decent social following. But, there are also a number of important things missing:
1. Lead Capture (it must be dead simple for people to engage you via web form AND phone - I recommend against posting email addresses as they attract spammers)
2. Eye Candy (your site is dangerously light on visuals and heavy on text – it's the newspaper equivalent of "all grey", or blue in the case of your site)
3. Obvious Next Steps (successful websites deploy content and offers that guide visitors through their sales funnel. Let's not kid ourselves - when it comes to online marketing, our #1 goal is first and foremost to grow our business with willing and well-educated clients. The further down the sales funnel they travel, the more they self-qualify).
A few questions:
1. Are you engaging your social connections? (get to know what they are about)
2. Are you sharing your connections' content? (what's in it for them?)
3. Can you lessen the number of menus popping up all over the site? (it casts doubt on your site's credibility)
In closing (for now), I'd say there are no longer any "tricks" in the seo basket, save one: great, sharable content. Anything else will either do nothing – or worse – harm your site's reputation.
If you are interested, I recently published an eBook (Kindle $2.99) on this topic: Findability: Why Search Engine Optimization is Dying + 21 New Rules of Content Marketing for 2013 and Beyond